Add Ruby 3.4 to CI (#16)

Author: krystof-k

.github/workflows/build-and-test.yaml

@@ -11,7 +11,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3']
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository
@@ -32,7 +32,7 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3']
+        ruby: ['2.7', '3.0', '3.1', '3.2', '3.3', '3.4']
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout repository