Update package.json

The `@actions/core` package has been updated to squash this warning:

> 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/

Notes:

> Action authors who are using the toolkit should update the @actions/core package to v1.10.0 or greater to get the updated saveState and setOutput functions.

https://github.com/actions/toolkit/blob/main/packages/core/RELEASES.md
> ### 1.10.0
> - `saveState` and `setOutput` now use environment files if available [#1178](actions/toolkit#1178)

package.json

@@ -23,6 +23,6 @@
   },
   "homepage": "https://github.com/petehouston/github-actions-query-branch-name#readme",
   "dependencies": {
-    "@actions/core": "^1.2.7"
+    "@actions/core": "^1.10.0"
   }
 }