fix(deps): update dependency pg-connection-string to v2.6.4 (#6841)

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This PR contains the following updates:

| Package | Change | Age | Adoption | Passing | Confidence |
|---|---|---|---|---|---|
|
[pg-connection-string](https://togithub.com/brianc/node-postgres/tree/master/packages/pg-connection-string)
([source](https://togithub.com/brianc/node-postgres/tree/HEAD/packages/pg-connection-string))
| [`2.6.2` ->
`2.6.4`](https://renovatebot.com/diffs/npm/pg-connection-string/2.6.2/2.6.4)
|
[![age](https://developer.mend.io/api/mc/badges/age/npm/pg-connection-string/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![adoption](https://developer.mend.io/api/mc/badges/adoption/npm/pg-connection-string/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![passing](https://developer.mend.io/api/mc/badges/compatibility/npm/pg-connection-string/2.6.2/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|
[![confidence](https://developer.mend.io/api/mc/badges/confidence/npm/pg-connection-string/2.6.2/2.6.4?slim=true)](https://docs.renovatebot.com/merge-confidence/)
|

---

### Release Notes

<details>
<summary>brianc/node-postgres (pg-connection-string)</summary>

###
[`v2.6.4`](https://togithub.com/brianc/node-postgres/compare/pg-connection-string@2.6.3...pg-connection-string@2.6.4)

[Compare
Source](https://togithub.com/brianc/node-postgres/compare/pg-connection-string@2.6.3...pg-connection-string@2.6.4)

###
[`v2.6.3`](https://togithub.com/brianc/node-postgres/compare/pg-connection-string@2.6.2...pg-connection-string@2.6.3)

[Compare
Source](https://togithub.com/brianc/node-postgres/compare/pg-connection-string@2.6.2...pg-connection-string@2.6.3)

</details>

---

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yarn.lock

@@ -5699,9 +5699,9 @@ pg-connection-string@2.6.1:
   integrity sha512-w6ZzNu6oMmIzEAYVw+RLK0+nqHPt8K3ZnknKi+g48Ak2pr3dtljJW3o+D/n2zzCG07Zoe9VOX3aiKpj+BN0pjg==
 
 pg-connection-string@^2.5.0, pg-connection-string@^2.6.2:
-  version "2.6.2"
-  resolved "https://registry.yarnpkg.com/pg-connection-string/-/pg-connection-string-2.6.2.tgz#713d82053de4e2bd166fab70cd4f26ad36aab475"
-  integrity sha512-ch6OwaeaPYcova4kKZ15sbJ2hKb/VP48ZD2gE7i1J+L4MspCtBMAx8nMgz7bksc7IojCIIWuEhHibSMFH8m8oA==
+  version "2.6.4"
+  resolved "https://registry.yarnpkg.com/pg-connection-string/-/pg-connection-string-2.6.4.tgz#f543862adfa49fa4e14bc8a8892d2a84d754246d"
+  integrity sha512-v+Z7W/0EO707aNMaAEfiGnGL9sxxumwLl2fJvCQtMn9Fxsg+lPpPkdcyBSv/KFgpGdYkMfn+EI1Or2EHjpgLCA==
 
 pg-int8@1.0.1:
   version "1.0.1"