fix(deps): update dependency cloudevents to v6 (#451)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
| [cloudevents](https://togithub.com/cloudevents/sdk-javascript) | [`^5.3.2` -> `^6.0.0`](https://renovatebot.com/diffs/npm/cloudevents/5.3.2/6.0.1) | [![age](https://badges.renovateapi.com/packages/npm/cloudevents/6.0.1/age-slim)](https://docs.renovatebot.com/merge-confidence/) | [![adoption](https://badges.renovateapi.com/packages/npm/cloudevents/6.0.1/adoption-slim)](https://docs.renovatebot.com/merge-confidence/) | [![passing](https://badges.renovateapi.com/packages/npm/cloudevents/6.0.1/compatibility-slim/5.3.2)](https://docs.renovatebot.com/merge-confidence/) | [![confidence](https://badges.renovateapi.com/packages/npm/cloudevents/6.0.1/confidence-slim/5.3.2)](https://docs.renovatebot.com/merge-confidence/) |

---

### Release Notes

<details>
<summary>cloudevents/sdk-javascript</summary>

### [`v6.0.1`](https://togithub.com/cloudevents/sdk-javascript/blob/HEAD/CHANGELOG.md#&#8203;601-httpswwwgithubcomcloudeventssdk-javascriptcomparev600v601-2022-03-21)

[Compare Source](https://togithub.com/cloudevents/sdk-javascript/compare/v6.0.0...v6.0.1)

### [`v6.0.0`](https://togithub.com/cloudevents/sdk-javascript/blob/HEAD/CHANGELOG.md#&#8203;600-httpswwwgithubcomcloudeventssdk-javascriptcomparev532v600-2022-03-21)

[Compare Source](https://togithub.com/cloudevents/sdk-javascript/compare/v5.3.2...v6.0.0)

##### ⚠ BREAKING CHANGES

-   add http transport and remove axios ([#&#8203;481](https://togithub.com/cloudevents/sdk-javascript/issues/481))

##### Features

-   add http transport and remove axios ([#&#8203;481](https://www.togithub.com/cloudevents/sdk-javascript/issues/481)) ([0362a4f](https://www.github.com/cloudevents/sdk-javascript/commit/0362a4f11c7bdc74a3a9a05b5bb4a94516b15a44))
-   precompile cloudevent schema ([#&#8203;471](https://www.togithub.com/cloudevents/sdk-javascript/issues/471)) ([b13bde9](https://www.github.com/cloudevents/sdk-javascript/commit/b13bde9b4967f5c8b02b788a40a89dd4cec5b78a))

##### Miscellaneous

-   add an npm test:once script ([#&#8203;480](https://www.togithub.com/cloudevents/sdk-javascript/issues/480)) ([b4d7aa9](https://www.github.com/cloudevents/sdk-javascript/commit/b4d7aa9adbb92bb5d037c464dd3d4bcd1ba88fe6))
-   update package.json format and deps ([#&#8203;479](https://www.togithub.com/cloudevents/sdk-javascript/issues/479)) ([6204805](https://www.github.com/cloudevents/sdk-javascript/commit/6204805bfcebf68fd1b94777ecb3df6d7473e10e))
-   update the release documentation ([#&#8203;476](https://www.togithub.com/cloudevents/sdk-javascript/issues/476)) ([c420da4](https://www.github.com/cloudevents/sdk-javascript/commit/c420da479343bc71a5ba4d5ed41841280f4c989a))

##### Documentation

-   update readme to include http builtin transport ([#&#8203;483](https://www.togithub.com/cloudevents/sdk-javascript/issues/483)) ([4ab6356](https://www.github.com/cloudevents/sdk-javascript/commit/4ab6356bd70434e55938ff89e940952f8b0105a3))

##### [5.3.2](https://www.github.com/cloudevents/sdk-javascript/compare/v5.3.1...v5.3.2) (2022-02-11)

##### Bug Fixes

-   use `isolatedModules: true` in tsconfig.json ([#&#8203;469](https://www.togithub.com/cloudevents/sdk-javascript/issues/469)) ([b5c0b56](https://www.github.com/cloudevents/sdk-javascript/commit/b5c0b56f52dd6119949df1a583b76a48c6e3cec7))

##### Miscellaneous

-   bump typedoc to remove vuln ([#&#8203;472](https://www.togithub.com/cloudevents/sdk-javascript/issues/472)) ([c3d9f39](https://www.github.com/cloudevents/sdk-javascript/commit/c3d9f39a53afaf411fa91aeb2323fef2eddb4d32))

##### [5.3.1](https://www.github.com/cloudevents/sdk-javascript/compare/v5.3.0...v5.3.1) (2022-02-02)

##### Bug Fixes

-   improve binary data detection in HTTP transport ([#&#8203;468](https://www.togithub.com/cloudevents/sdk-javascript/issues/468)) ([cd4dea9](https://www.github.com/cloudevents/sdk-javascript/commit/cd4dea954b1797eb0e0fe2acd1b32ef75a3b7b65))
-   package.json & package-lock.json to reduce vulnerabilities ([#&#8203;462](https://www.togithub.com/cloudevents/sdk-javascript/issues/462)) ([ae8fa79](https://www.github.com/cloudevents/sdk-javascript/commit/ae8fa799afea279adfbd1f35103fb168621c8a24))

##### Documentation

-   add TS examples for CloudEvent usage ([#&#8203;461](https://www.togithub.com/cloudevents/sdk-javascript/issues/461)) ([c603831](https://www.github.com/cloudevents/sdk-javascript/commit/c603831e934c68c1f430708b5bff4dad938093dd))
-   fix ts example ([#&#8203;467](https://www.togithub.com/cloudevents/sdk-javascript/issues/467)) ([349b84c](https://www.github.com/cloudevents/sdk-javascript/commit/349b84c3dad5d282d24780a884a0f94643871247))

##### Miscellaneous

-   update readme with current Node LTS versions and add Node 16 to the testing matrix([#&#8203;465](https://www.togithub.com/cloudevents/sdk-javascript/issues/465)) ([8abbc11](https://www.github.com/cloudevents/sdk-javascript/commit/8abbc114af4b784c5061737f432f0af9ccb6c6f2))

</details>

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package.json

@@ -14,7 +14,7 @@
   },
   "dependencies": {
     "body-parser": "^1.18.3",
-    "cloudevents": "^5.3.2",
+    "cloudevents": "^6.0.0",
     "express": "^4.16.4",
     "minimist": "^1.2.5",
     "on-finished": "^2.3.0",