ci: remove go 1.20 (#2310)

Co-authored-by: Rémy Léone <[email protected]>

Author: Codelax

.github/workflows/unit-tests.yaml

@@ -8,7 +8,7 @@ jobs:
   tests:
     strategy:
       matrix:
-        go-version: [1.20.x, 1.21.x]
+        go-version: [1.21.x]
         platform: [ubuntu-latest]
     runs-on: ${{ matrix.platform }}
     steps: