Update dependency @actions/github to v6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@actions/github (source)	^2.2.0 -> ^6.0.0

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Release Notes

actions/toolkit (@​actions/github)

v6.0.0

• Support the latest Octokit in @​actions/github #​1553
  • Drop support of NodeJS v14, v16

v5.1.1

• Export default octokit options #​1188

v5.1.0

• Add additionalPlugins parameter to getOctokit method #​1181
• Dependency updates #​1180

v5.0.3

• • Update to v2.0.1 of @actions/http-client #​1087

v5.0.2

• Update to v2.0.0 of @actions/http-client

v5.0.1

• Update Octokit Dependencies

v5.0.0

• Update @​actions/github to include latest octokit definitions
• Add urls to context

v4.0.0

• Add execution state information to context
• Update Octokit Dependencies with some api breaking changes
  • The full list of api changes are here
  • GitHub.plugin() no longer supports an array as first argument. Multiple args must be passed in instead.

v3.0.0

• Swap to @​octokit/core and use plugins to leverage lastest octokit apis
• Add comment field to payload context

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