CI: Update to GITHUB_OUTPUT syntax

.github/workflows/windows-build.yml

@@ -29,7 +29,8 @@ jobs:
     steps:
     - name: Get current date as package key
       id: pkg_key
-      run: echo "::set-output name=key::$(date +'%W')"
+      run: echo "key=$(date +'%W')" >> $GITHUB_OUTPUT
+      shell: bash
 
     - name: Checkout repository
       uses: actions/checkout@v3
@@ -51,7 +52,7 @@ jobs:
     # Fetch xmake dephash
     - name: Retrieve dependencies hash
       id: dep_hash
-      run: echo "::set-output name=hash::$(xmake l utils.ci.packageskey)"
+      run: echo "hash=$(xmake l utils.ci.packageskey)" | Out-File -FilePath $env:GITHUB_OUTPUT -Encoding utf8 -Append
 
     # Cache xmake dependencies
     - name: Retrieve cached xmake dependencies