Update workflow skip condition

.github/workflows/bump-date.yml

     - name: Bump Distribution Date
       run: |
         # Inline Bump Script
-        [[ "$GITHUB_ACTOR" == 'MarlinFirmware' ]] || exit 0
+        [[ "$GITHUB_REPOSITORY" == "MarlinFirmware/Marlin" ]] || exit 0
         DIST=$( date +"%Y-%m-%d" )
         eval "sed -E -i 's/(#define +STRING_DISTRIBUTION_DATE) .*$/\1 \"$DIST\"/g' Marlin/src/inc/Version.h" && \
         git config user.name "${GITHUB_ACTOR}" && \

.github/workflows/check-pr.yml

 #
 # check-pr.yml
-# Automatically close the PR if it's directed to a release branch
+# Add a comment to the PR if it's directed to a release branch
 #
 
 name: Check PR

.github/workflows/test-builds.yml

     - name: Run ${{ matrix.test-platform }} Tests
       run: |
         # Inline tests script
-        [[ "$GITHUB_ACTOR" == 'MarlinFirmware' ]] || exit 0
+        [[ "$GITHUB_REPOSITORY" == "MarlinFirmware/Marlin" ]] || exit 0
         chmod +x buildroot/bin/*
         chmod +x buildroot/share/tests/*
         export PATH=./buildroot/bin/:./buildroot/share/tests/:${PATH}