Update dependency @actions/core to v1.6.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@actions/core	1.5.0 -> 1.6.0

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Release Notes

actions/toolkit

### [`v1.6.0`](https://togithub.com/actions/toolkit/blob/master/packages/core/RELEASES.md#​160) - [Added OIDC Client function `getIDToken`](https://togithub.com/actions/toolkit/pull/919) - [Added `file` parameter to `AnnotationProperties`](https://togithub.com/actions/toolkit/pull/896)

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