CI: Replace set-output with environment file

https://github.blog/changelog/2022-10-11-github-actions-deprecating-save-state-and-set-output-commands/

.github/workflows/release.yml

@@ -13,8 +13,8 @@ jobs:
       - name: Set variables
         id: init
         run: |
-          echo ::set-output name=tag::${GITHUB_REF#refs/tags/}
-          echo ::set-output name=version::${GITHUB_REF#refs/tags/v}
+          echo "tag=${GITHUB_REF#refs/tags/}" >> $GITHUB_OUTPUT
+          echo "version=${GITHUB_REF#refs/tags/v}" >> $GITHUB_OUTPUT
       - name: Checkout
         uses: actions/checkout@v2
       - name: Write release body
@@ -22,25 +22,25 @@ jobs:
         run: |
           FILENAME=RELEASE.md
           extras/scripts/get-release-body.sh ${{ steps.init.outputs.tag }} CHANGELOG.md | tee $FILENAME
-          echo ::set-output name=filename::$FILENAME
+          echo "filename=$FILENAME" >> $GITHUB_OUTPUT
       - name: Amalgamate ArduinoJson.h
         id: amalgamate_h
         run: |
           FILENAME=ArduinoJson-${{ steps.init.outputs.tag }}.h
           extras/scripts/build-single-header.sh src/ArduinoJson.h "$FILENAME"
-          echo ::set-output name=filename::$FILENAME
+          echo "filename=$FILENAME" >> $GITHUB_OUTPUT
       - name: Amalgamate ArduinoJson.hpp
         id: amalgamate_hpp
         run: |
           FILENAME=ArduinoJson-${{ steps.init.outputs.tag }}.hpp
           extras/scripts/build-single-header.sh src/ArduinoJson.hpp "$FILENAME"
-          echo ::set-output name=filename::$FILENAME
+          echo "filename=$FILENAME" >> $GITHUB_OUTPUT
       - name: Create Arduino package
         id: arduino
         run: |
           FILENAME=ArduinoJson-${{ steps.init.outputs.tag }}.zip
           extras/scripts/build-arduino-package.sh . "$FILENAME"
-          echo ::set-output name=filename::$FILENAME
+          echo "filename=$FILENAME" >> $GITHUB_OUTPUT
       - name: Create release
         uses: ncipollo/release-action@v1
         with: