fix: upgrade @actions/core to v1.10.0 to resolve set-output deprecation warning

[adamstankiewicz]

Example warning output when running sync-branches:

Related issue: https://github.com/TreTuna/sync-branches/issues/71

Based on GitHub documentation, upgrading @actions/core to v1.10.0 should resolve the deprecation warning: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

[adamstankiewicz]

@TreTuna This PR should resolve the deprecation warning for set-output based on the GitHub documentation. Can you please take a look? Thanks in advance!