Merge pull request #3794 from projectblacklight/bundler-2

Explicitly use bundler 2.7 on Ruby 4 CI

Author: jcoyne

.github/matrix.json

@@ -2,6 +2,7 @@
   "ruby": ["3.4"],
   "rails_version": ["8.1.1"],
   "bootstrap_version": [null],
+  "bundler_version": ["2.7.2"],
   "view_component_version": ["~> 4.0"],
   "api": [null],
   "additional_engine_cart_rails_options": ["--css=bootstrap"],

.github/workflows/test.yml

@@ -36,6 +36,7 @@ jobs:
       BOOTSTRAP_VERSION: ${{ matrix.bootstrap_version }}
       BLACKLIGHT_API_TEST: ${{ matrix.api }}
       ENGINE_CART_RAILS_OPTIONS: "--skip-git --skip-listen --skip-spring --skip-keeps --skip-kamal --skip-solid --skip-coffee --skip-test ${{ matrix.additional_engine_cart_rails_options }}"
+      BUNDLER_VERSION: ${{ matrix.bundler_version || '2.7.2' }}
     steps:
       - uses: actions/checkout@v4
         with:
@@ -44,6 +45,7 @@ jobs:
         uses: ruby/setup-ruby@v1
         with:
           ruby-version: ${{ matrix.ruby }}
+          bundler: ${{ matrix.bundler_version || '2.7.2' }}
       - name: Change permissions
         run: "chmod -f -R o-w /opt/hostedtoolcache/Ruby/3.2.5/x64/lib/ruby/gems/3.2.0/gems | :"
       - name: Install dependencies