bump minimum go version for main

Author: camdencheek

.github/workflows/main.yml

@@ -11,7 +11,7 @@ jobs:
   go-bench:
     strategy:
       matrix:
-        go-version: [ '1.19', 'stable' ]
+        go-version: [ '1.20', 'stable' ]
     runs-on: ubuntu-latest
     timeout-minutes: 15
     steps:
@@ -49,4 +49,4 @@ jobs:
           path: ./cache/benchmark-data.json
           # Save with commit hash to avoid "cache already exists"
           # Save with OS & CPU info to prevent comparing against results from different CPUs
-          key: ${{ github.sha }}-${{ runner.os }}-${{ steps.system-info.outputs.cpu-model }}-go-benchmark
+          key: ${{ github.sha }}-${{ runner.os }}-${{ steps.system-info.outputs.cpu-model }}-go-benchmark