try to pin semver-checks in CI

Author: molpopgen

.github/workflows/semver.yml

@@ -22,6 +22,6 @@ jobs:
       - name: Install cargo-semver-checks
         uses: baptiste0928/[email protected]
         with:
-          crate: cargo-semver-checks
+          crate: cargo-semver-checks@0.43.0
       - name: run check-release
         run: cargo semver-checks check-release