Restrict GitHub Actions workflow permissions for newgem

- Configure minimal required permissions in the GitHub Actions workflow template
- Bump actions/checkout from 4 to 6
- Bump actions/upload-artifact from 3 to 7

Author: taketo1113

bundler/lib/bundler/templates/newgem/github/workflows/build-gems.yml.tt

@@ -8,6 +8,10 @@ on:
       - "cross-gem/*"
   workflow_dispatch:
 
+permissions:
+  contents: read
+  packages: write
+
 jobs:
   ci-data:
     runs-on: ubuntu-latest
@@ -25,7 +29,7 @@ jobs:
   source-gem:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with:
@@ -34,7 +38,7 @@ jobs:
       - name: Build gem
         run: bundle exec rake build
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v7
         with:
           name: source-gem
           path: pkg/*.gem
@@ -47,7 +51,7 @@ jobs:
       matrix:
         platform: ${{ fromJSON(needs.ci-data.outputs.result).supported-ruby-platforms }}
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
 
       - uses: ruby/setup-ruby@v1
         with:
@@ -59,7 +63,7 @@ jobs:
           platform: ${{ matrix.platform }}
           ruby-versions: ${{ join(fromJSON(needs.ci-data.outputs.result).stable-ruby-versions, ',') }}
 
-      - uses: actions/upload-artifact@v3
+      - uses: actions/upload-artifact@v7
         with:
           name: cross-gem
           path: ${{ steps.cross-gem.outputs.gem-path }}

bundler/lib/bundler/templates/newgem/github/workflows/main.yml.tt

@@ -7,6 +7,9 @@ on:
 
   pull_request:
 
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest
@@ -17,7 +20,7 @@ jobs:
           - '<%= RUBY_VERSION %>'
 
     steps:
-      - uses: actions/checkout@v4
+      - uses: actions/checkout@v6
         with:
           persist-credentials: false
 <%- if config[:ext] == 'rust' -%>