build: Test against Go 1.27.

This updates CI to test against Go 1.27 with linting at Go 1.26 and
removes the tests for Go 1.25 accordingly.

Author: davecgh

.github/workflows/go.yml

@@ -23,7 +23,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go: ["1.25", "1.26"]
+        go: ["1.26", "1.27"]
     steps:
       - name: Check out source
         uses: actions/checkout@3d3c42e5aac5ba805825da76410c181273ba90b1 # v7.0.1
@@ -52,7 +52,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@b7ad1dad31e06c5925ef5d2fc7ad053ef454303e # v7.0.0
         with:
-          go-version: "1.25"
+          go-version: "1.26"
       - name: golangci-lint
         uses: golangci/golangci-lint-action@ba0d7d2ec06a0ea1cb5fa41b2e4a3ab91d21278a # v9.3.0
         with: