Fix benchmark CI working directory

Author: SaridakisStamatisChristos

.github/workflows/ci.yml

@@ -31,12 +31,10 @@ jobs:
         with:
           python-version: "3.11"
       - name: Install bench extras
-        working-directory: kll_sketch
         run: |
           python -m pip install --upgrade pip
-          python -m pip install -e .[bench]
+          python -m pip install -e './kll_sketch[bench]'
       - name: Run smoke benchmark
-        working-directory: kll_sketch
         run: |
           python benchmarks/bench_kll.py \
             --outdir bench_out \
@@ -49,4 +47,4 @@ jobs:
         uses: actions/upload-artifact@v4
         with:
           name: bench-out
-          path: kll_sketch/bench_out
+          path: bench_out