Bump actions/setup-go from 5 to 6 (#105)

Author: dependabot[bot]

.github/workflows/tests.yaml

@@ -18,7 +18,7 @@ jobs:
         uses: actions/checkout@v4
 
       - name: Install Go
-        uses: actions/setup-go@v5
+        uses: actions/setup-go@v6
         with:
           go-version-file: go.mod