Use Go 1.26.6 in test and release CI

Author: FZambia

.github/workflows/release.yml

@@ -10,7 +10,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        go-version: [1.26.5]
+        go-version: [1.26.6]
     steps:
       - name: Install Go
         uses: actions/setup-go@v7

.github/workflows/test.yml

@@ -32,7 +32,7 @@ jobs:
     if: github.event_name == 'push' || github.event.pull_request.head.repo.full_name != github.repository
     strategy:
       matrix:
-        go-version: [1.26.5]
+        go-version: [1.26.6]
     steps:
       - name: Checkout code
         uses: actions/checkout@v7