ci: Fix SNAPSHOT publishing problem

This commit addresses an issue of snapshots not
being published by removing the use of `GH_TOKEN` during the
repository checkout process in the workflow file.

The error message is "Error: fatal: could not read Username for
'https://github.com': terminal prompts disabled" when
`actions/checkout@v4` does git fetch.

Author: matrei

.github/workflows/gradle.yml

@@ -45,8 +45,6 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
-        with:
-          token: ${{ secrets.GH_TOKEN }}
       - name: Set up JDK 11
         uses: actions/setup-java@387ac29b308b003ca37ba93a6cab5eb57c8f5f93 # v4
         with: