Update CI Go versions: 1.24/1.25 to 1.25/1.26

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: fujiwara

.github/workflows/tagpr-release.yml

@@ -34,7 +34,7 @@ jobs:
       - name: Set up Go
         uses: actions/setup-go@44694675825211faa026b3c33043df3e48a5fa00 # v6
         with:
-          go-version: "1.24"
+          go-version: "1.25"
           go-version-file: ./go.mod
           cache: true
 

.github/workflows/test.yml

@@ -5,8 +5,8 @@ jobs:
     strategy:
       matrix:
         go:
-          - "1.24"
           - "1.25"
+          - "1.26"
     name: Build
     runs-on: ubuntu-latest
     steps: