Update dependency go to 1.26.x

Author: renovate[bot]

.github/workflows/go-coverage.yml

@@ -27,7 +27,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: "1.25.x"
+          go-version: "1.26.x"
 
       - name: Build
         run: go build -v ./...