fix(ci): pin semver to v2.12.0 for Go 1.25 compatibility

semver@latest requires Go 1.26.1 but the project uses Go 1.25.4.
Pinning to v2.12.0 which is compatible with Go 1.25.

Signed-off-by: yxxhero <aiopsclub@163.com>

.github/workflows/ci.yaml

@@ -147,7 +147,7 @@ jobs:
         with:
           name: built-binaries-${{ github.run_id }}
       - name: install semver
-        run: go install github.com/ffurrer2/semver/v2/cmd/semver@latest
+        run: go install github.com/ffurrer2/semver/v2/cmd/semver@v2.12.0
       - name: Extract tar to get built binaries
         run: tar -xvf built-binaries.tar
       - name: Display built binaries