Use Python and Go versions provided by cisagov/setup-env-github-action

Author: mcdonnnj

.github/workflows/build.yml

@@ -59,7 +59,7 @@ jobs:
       - id: setup-python
         uses: actions/setup-python@v5
         with:
-          python-version: "3.11"
+          python-version: ${{ steps.setup-env.outputs.python-version }}
       # We need the Go version and Go cache location for the actions/cache step,
       # so the Go installation must happen before that.
       - id: setup-go
@@ -68,7 +68,7 @@ jobs:
           # There is no expectation for actual Go code so we disable caching as
           # it relies on the existence of a go.sum file.
           cache: false
-          go-version: "1.20"
+          go-version: ${{ steps.setup-env.outputs.go-version }}
       - id: go-cache
         name: Lookup Go cache directory
         run: |