Fix: [CI] don't share Rust cache between legacy and generic linux (#11848)

The resulting binaries of generic can't run on legacy.

(cherry picked from commit 526a0db956)

.github/workflows/release-linux-legacy.yml

@@ -52,6 +52,8 @@ jobs:
 
     - name: Enable Rust cache
       uses: Swatinem/rust-cache@v2.7.0
+      with:
+        key: legacy
 
     - name: Setup vcpkg caching
       uses: actions/github-script@v6