CI: Downgrade libloading to 0.8.8 in MSRV test

The `0.8.9` release bumped MSRV from `1.56` to `1.71`, making it
incompatible with our MSRV test in CI.

Author: MarijnS95

.github/workflows/ci.yml

@@ -16,6 +16,9 @@ jobs:
     steps:
       - uses: actions/checkout@v5
       - uses: dtolnay/[email protected]
+      - name: Downgrade incompatible dependencies
+        run: |
+          cargo update -p libloading --precise 0.8.8
       - name: Check ash, ash-window and ash-rewrite
         run: cargo check -p ash -p ash-rewrite -p ash-window --all-features
       - name: Check ash with no_std