Use xmake dev for CI (until xmake 2.5.4 is out)

.github/workflows/linux-build.yml

@@ -45,6 +45,8 @@ jobs:
     # Install xmake
     - name: Setup xmake
       uses: xmake-io/github-action-setup-xmake@v1
+      with:
+        xmake-version: branch@dev
 
     # Update xmake repository (in order to have the file that will be cached)
     - name: Update xmake repository
@@ -53,7 +55,7 @@ jobs:
     # Fetch xmake dephash
     - name: Retrieve dependencies hash
       id: dep_hash
-      run: echo "::set-output name=hash::$(xmake dephash)"
+      run: echo "::set-output name=hash::$(xmake l utils.ci.packageskey)"
   
     # Cache xmake dependencies
     - name: Retrieve cached xmake dependencies