.github: always run @latest dependency tests with latest Go version

Work around golang/go#79917.

Author: FiloSottile

.github/workflows/test.yml

@@ -13,21 +13,19 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        go:
-          - { go-version: stable }
-          - { go-version: oldstable }
-          - { go-version-file: go.mod }
-        deps:
-          - locked
-          - latest
+        include:
+          - { go-version: stable, deps: locked }
+          - { go-version: oldstable, deps: locked }
+          - { go-version-file: go.mod, deps: locked }
+          - { go-version: stable, deps: latest }
     steps:
       - uses: actions/checkout@v5
         with:
           persist-credentials: false
       - uses: actions/setup-go@v6
         with:
-          go-version: ${{ matrix.go.go-version }}
-          go-version-file: ${{ matrix.go.go-version-file }}
+          go-version: ${{ matrix.go-version }}
+          go-version-file: ${{ matrix.go-version-file }}
       - uses: geomys/sandboxed-step@v1.2.0
         with:
           run: |