Update dependency @actions/core to v1.9.1

[renovate-bot]

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This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@actions/core (source)	1.6.0 -> 1.9.1

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Release Notes

actions/toolkit

v1.9.1

• Randomize delimiter when calling core.exportVariable

v1.9.0

• Added toPosixPath, toWin32Path and toPlatformPath utilities #​1102

v1.8.2

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

v1.8.1

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

v1.8.0

• Deprecate markdownSummary extension export in favor of summary
  • https://github.com/actions/toolkit/pull/1072
  • https://github.com/actions/toolkit/pull/1073

v1.7.0

• Added markdownSummary extension

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