ci: run linux tests on 1.24, 1.25 and tip

Author: arl

.github/workflows/tests-linux.yml

@@ -4,13 +4,11 @@ jobs:
   tests-linux:
     strategy:
       matrix:
-        go-version: [1.23.x, 1.24.x, 1.25.x]
+        go-version: [1.24.x, 1.25.x, tip]
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/setup-go@v5
-        with:
-          go-version-file: go.mod
+      - uses: actions/checkout@v5
+      - uses: actions/setup-go@v6
       - name: go mod tidy check
         run: go mod tidy -diff
       - name: Tests