ci: bump turbo cache key prefix to v2

Abandons stale cache entries that replay an outdated @codspeed/core
build missing the wrapWithRootFrame helpers.

Author: not-matthias

.github/actions/turbo-cache/action.yml

@@ -22,7 +22,7 @@ runs:
     - uses: actions/cache@v4
       with:
         path: .turbo/cache
-        key: turbo-${{ runner.os }}-${{ runner.arch }}-${{ inputs.key-suffix }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ github.sha }}
+        key: turbo-v2-${{ runner.os }}-${{ runner.arch }}-${{ inputs.key-suffix }}-${{ hashFiles('pnpm-lock.yaml') }}-${{ github.sha }}
         restore-keys: |
-          turbo-${{ runner.os }}-${{ runner.arch }}-${{ inputs.key-suffix }}-${{ hashFiles('pnpm-lock.yaml') }}-
-          turbo-${{ runner.os }}-${{ runner.arch }}-${{ inputs.key-suffix }}-
+          turbo-v2-${{ runner.os }}-${{ runner.arch }}-${{ inputs.key-suffix }}-${{ hashFiles('pnpm-lock.yaml') }}-
+          turbo-v2-${{ runner.os }}-${{ runner.arch }}-${{ inputs.key-suffix }}-