Add missing extra cache key for Linux sanitized.

Otherwise, there are collisions in the CI.

.github/workflows/ci-unix-static-sanitized.yml

diff --git a/.github/workflows/ci-unix-static-sanitized.yml b/.github/workflows/ci-unix-static-sanitized.yml
index ae32bc7..0e2dc1e 100644
--- a/.github/workflows/ci-unix-static-sanitized.yml
+++ b/.github/workflows/ci-unix-static-sanitized.yml
@@ -34,6 +34,7 @@
           codec-dav1d: 'LOCAL'
           libyuv: 'LOCAL'
           recent-cmake: 'true'
+          extra-cache-key: ${{ matrix.sanitizer }}
       - uses: ./.github/actions/setup-macos
         if: runner.os == 'macOS'
         id: setup_macos