Update dependency go to 1.26

Author: renovate[bot]

.github/workflows/codetests.yml

@@ -16,7 +16,7 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-go@v5
         with:
-          go-version: 1.19
+          go-version: 1.26
       - name: go-test
         run: 	go test -race '-test.v' -covermode=atomic  ./...
   # Runs golangci-lint on macos against freebsd and macos.
@@ -31,7 +31,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v5
         with:
-          go-version: 1.19
+          go-version: 1.26
       - uses: actions/checkout@v4
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6
@@ -49,7 +49,7 @@ jobs:
     steps:
       - uses: actions/setup-go@v5
         with:
-          go-version: 1.19
+          go-version: 1.26
       - uses: actions/checkout@v4
       - name: golangci-lint
         uses: golangci/golangci-lint-action@v6