ci: update github action · cxfksword/jellyfin-plugin-metashark@fe717ef

The `set-output` command is deprecated and will be disabled soon. Please upgrade to using Environment Files. For more information see: https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

Dereference of a possibly null reference.

Possible null reference return.

Possible null reference return.

The variable 'ex' is declared but never used

Possible null reference return.

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

Unreachable code detected

Cannot convert null literal to non-nullable reference type.

Cannot convert null literal to non-nullable reference type.

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