ci: remove build workflows for Vaadin 23 and 24

Close #27

Author: javier-godoy

.github/workflows/maven.yml

@@ -27,29 +27,3 @@ jobs:
         cache: maven
     - name: Build (Vaadin 14)
       run: mvn -B package --file pom.xml
-      
-  build-vaadin23:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up JDK
-      uses: actions/setup-java@v3
-      with:
-        java-version: '11'
-        distribution: 'temurin'
-        cache: maven
-    - name: Build (Vaadin 23)
-      run: mvn -B package --file pom.xml -Pv23
-
-  build-vaadin24:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v3
-    - name: Set up JDK
-      uses: actions/setup-java@v3
-      with:
-        java-version: '17'
-        distribution: 'temurin'
-        cache: maven
-    - name: Build (Vaadin 24)
-      run: mvn -B package --file pom.xml -Pv24