chore: drop valgrind-based benchmarking

The valgrind output seems to have changed (`KeyError: 'DLmr'`). Dropping
the feature because I couldn't find a fix.

Author: czosel

.github/workflows/test.yml

@@ -29,26 +29,3 @@ jobs:
           yarn build-types
           [ $(git diff types.d.ts | wc -l) -gt 0 ] && echo 'Diff exists in types.d.ts. Please change jsdoc.' && exit 1
           tsc --noEmit types.d.ts
-
-      - name: install valgrind
-        run: sudo apt-get install -y valgrind
-
-      - name: benchmark
-        run: python cachegrind.py node test/benchmark2.js > output.txt
-
-      - name: Download previous benchmark result
-        uses: actions/cache@v4
-        with:
-          path: ./cache
-          key: ${{ runner.os }}-${{matrix.node-version}}-benchmark
-
-      - name: Store benchmark result
-        uses: benchmark-action/github-action-benchmark@v1
-        with:
-          tool: "customSmallerIsBetter"
-          output-file-path: output.txt
-          external-data-json-path: ./cache/benchmark-data.json
-          alert-threshold: "105%"
-          fail-on-alert: true
-        env:
-          CI: true