fix: dont use workspace macro in matrix

Author: not-matthias

.github/workflows/codspeed.yml

@@ -17,7 +17,7 @@ jobs:
           - testdata/take_strings-aarch64
         valgrind: 
           - /usr/bin/valgrind
-          - ${{ github.workspace }}/vg-in-place
+          - ../vg-in-place
     steps:
       - uses: actions/checkout@v4
         with: