Benchmark fix (#353)

* simplify conditional

* don't fetch specific branch

* attempt fix

* another attempt

Author: melonora

.github/workflows/test.yml

@@ -81,6 +81,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           fetch-depth: 0
+          ref: ${{ github.ref }}
 
       - uses: actions/setup-python@v5
         with:
@@ -124,7 +125,9 @@ jobs:
           PIP_CONSTRAINT: ${{ github.workspace }}/benchmarks/benchmark.txt
 
       - name: Fetch main branch
-        run: git fetch origin main:main
+        run: |
+          git fetch origin main
+          git branch main FETCH_HEAD
 
       - name: Run benchmarks latest release
         # here we check if the benchmark on the latest release is not broken