workflow: do the checkout first

so we should be able to utilise deps cache

.github/workflows/tests.yml

@@ -11,12 +11,12 @@ jobs:
                 go: ["1.18", "1.19", "1.20"]
 
         steps:
+            - uses: actions/checkout@v3
             - name: setup Go
               uses: actions/setup-go@v4
               with:
                   go-version: ${{ matrix.go }}
 
-            - uses: actions/checkout@v3
             - name: resolve dependencies
               run: go get -v -t -d ./...
             - name: build