Replace deprecated `set-output` command with the new format

.github/workflows/dev.yml

@@ -92,7 +92,7 @@ jobs:
       - id: set-matrix
         run: |
           tests=$(find ./tests/core/ -maxdepth 1 -mindepth 1 -type d -printf "%f\n" | jq -c --raw-input --slurp 'split("\n")| .[0:-1]')
-          echo "::set-output name=tests::$tests"
+          echo "tests=$tests" >> $GITHUB_OUTPUT
     outputs:
       tests: ${{ steps.set-matrix.outputs.tests }}
   tests-core:

.github/workflows/push-github.yml

@@ -47,7 +47,7 @@ jobs:
           content="${content//'%'/'%25'}"
           content="${content//$'\n'/'%0A'}"
           content="${content//$'\r'/'%0D'}"
-          echo "::set-output name=content::$content"
+          echo "content=$content" >> $GITHUB_OUTPUT
       # Create release
       - name: Create release
         if: inputs.VERSION != 'testing'

.github/workflows/staging.yml

@@ -93,7 +93,7 @@ jobs:
       - id: set-matrix
         run: |
           tests=$(find ./tests/core/ -maxdepth 1 -mindepth 1 -type d -printf "%f\n" | jq -c --raw-input --slurp 'split("\n")| .[0:-1]')
-          echo "::set-output name=tests::$tests"
+          echo "tests=$tests" >> $GITHUB_OUTPUT
     outputs:
       tests: ${{ steps.set-matrix.outputs.tests }}