Use go-version-file instead of go-version (#4)

Author: wata727

.github/workflows/build.yml

@@ -23,7 +23,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v3
       with:
-        go-version: 1.19
+        go-version-file: 'go.mod'
     - name: Run tests
       run: make test
     - name: Run build

.github/workflows/release.yml

@@ -16,7 +16,7 @@ jobs:
     - name: Set up Go
       uses: actions/setup-go@v3
       with:
-        go-version: 1.19
+        go-version-file: 'go.mod'
     - name: Import GPG key
       id: import_gpg
       uses: crazy-max/ghaction-import-gpg@v5