build(deps): bump taskcluster from 19.0.0 to 20.0.0 in /tools

[dependabot-preview]

Bumps taskcluster from 19.0.0 to 20.0.0.

Release notes

Sourced from taskcluster's releases.

v20.0.0

[MAJOR] The worker-manager service's google provider type now requires that worker pool definitions contain an array of possible variations of workers for the pool, in the launchConfig property.
See google provider type for more detail.
Note that this is a breaking change that will cause all google-based worker pools to stop provisioning until they have been updated to the new format.
To update, change the config field by moving all fields except minCapacity and maxCapacity into an array in launchConfigs:

some/worker:
  config:
    minCapacity: 25
    maxCapacity: 50
-   region: us-central1
-   zone: us-central1-a
-   capacityPerInstance: 1
-   minCpuPlatform: "Intel Skylake"
-   ...
+   launchConfigs:
+     - region: us-central1
+       zone: us-central1-a
+       capacityPerInstance: 1
+       minCpuPlatform: "Intel Skylake"
+       ...

(bug 1585102) The GitHub service now posts a more useful comment to pull requests and commits when an InsufficientScopes error occurs.
The message now includes the scopes used to make the API call, including the assume:repo:.. role.

Changelog

Sourced from taskcluster's changelog.

v20.0.0

[MAJOR] The worker-manager service's google provider type now requires that worker pool definitions contain an array of possible variations of workers for the pool, in the launchConfig property.
See google provider type for more detail.
Note that this is a breaking change that will cause all google-based worker pools to stop provisioning until they have been updated to the new format.
To update, change the config field by moving all fields except minCapacity and maxCapacity into an array in launchConfigs:

some/worker:
  config:
    minCapacity: 25
    maxCapacity: 50
-   region: us-central1
-   zone: us-central1-a
-   capacityPerInstance: 1
-   minCpuPlatform: "Intel Skylake"
-   ...
+   launchConfigs:
+     - region: us-central1
+       zone: us-central1-a
+       capacityPerInstance: 1
+       minCpuPlatform: "Intel Skylake"
+       ...

(bug 1585102) The GitHub service now posts a more useful comment to pull requests and commits when an InsufficientScopes error occurs.
The message now includes the scopes used to make the API call, including the assume:repo:.. role.

Commits

• 69b954d v20.0.0
• dc700ea Update dependency xml2js to v0.4.22 (#1634)
• 641518f Update dependency xml2js to v0.4.22
• 6744a80 Merge pull request #1632 from renovate-bot/renovate/ws-shell-0.x-lockfile
• 59c6046 Update dependency ws-shell to v0.1.8
• 941b3b5 Merge pull request #1631 from renovate-bot/renovate/webpack-4.x-lockfile
• 7c4cdc7 Deep link filterby dropdown in provisioners (#1594)
• e5e03ef [UI] Remove indentation from Card title (#1625)
• 2cc7b34 [UI] Invite user to login in /profile when logged out #1581 (#1604)
• c05e91b Add flex-wrap style to view workers UI (#1628)
• Additional commits viewable in compare view

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[marco-c]

@dependabot rebase