CI: updated actions versions

.github/workflows/source-snapshot.yml

@@ -12,7 +12,7 @@ jobs:
 
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v4
+      uses: actions/checkout@v6
       with:
         submodules: recursive
 
@@ -22,7 +22,7 @@ jobs:
         XZ_OPT=-e9 tar --exclude=".git" --exclude="build" -f build/p2pool_source.tar.xz -c ../p2pool --xz
 
     - name: Archive source code
-      uses: actions/upload-artifact@v4
+      uses: actions/upload-artifact@v7
       with:
         name: p2pool_source.tar.xz
         path: build/p2pool_source.tar.xz