Only test against one version of bundler for now

Might be useful later but doesn't add anything during this upgrade.

Author: headius

.github/workflows/ci.yml

@@ -19,7 +19,6 @@ jobs:
       matrix:
         java-version: [8, 21]
         ruby-version: [jruby-9.4, jruby-10]
-        bundler-version: [2.6.3]
         task: ['', integration]
         exclude:
           # JRuby 10 requires Java 21 minimum
@@ -48,7 +47,7 @@ jobs:
           ruby-version: ${{ matrix.ruby-version }}
 
       - name: Install dependencies
-        run: bundle _${{ matrix.bundler-version }}_ install --jobs=3 --retry=3
+        run: bundle install --jobs=3 --retry=3
 
       - name: Run tests
         run: bundle exec rake ${{ matrix.TASK }}