chore: pin correctly some github actions still using the old way

Signed-off-by: Matthieu Gallien <matthieu.gallien@nextcloud.com>
Signed-off-by: Jyrki Gadinger <nilsding@nilsding.org>

Author: mgallien

.github/workflows/macos-build-and-test.yml

@@ -33,7 +33,7 @@ jobs:
           fetch-depth: 1
 
       - name: Setup Xcode
-        uses: maxim-lobanov/setup-xcode@v1
+        uses: maxim-lobanov/setup-xcode@60606e260d2fc5762a71e64e74b2174e8ea3c8bd # v1.6.0
         with:
           xcode-version: latest-stable