fixup: use matrix for e2e

Signed-off-by: Todd Baert <todd.baert@dynatrace.com>

Author: toddbaert

.github/workflows/ruby.yml

@@ -50,14 +50,21 @@ jobs:
     defaults:
       run:
         working-directory: ./providers/openfeature-flagd-provider
+    strategy:
+      fail-fast: false
+      matrix:
+        ruby-version:
+          - "3.3"
+          - "3.4"
+          - "4.0"
     steps:
     - uses: actions/checkout@v7
       with:
         submodules: recursive
     - name: Set up Ruby
       uses: ruby/setup-ruby@v1
       with:
-        ruby-version: "3.4"
+        ruby-version: ${{ matrix.ruby-version }}
         bundler-cache: true
         working-directory: ./providers/openfeature-flagd-provider
     - name: Run e2e (flagd-testbed / cucumber)