[cpp-qt-client] Stop using Qt 5.15.2 in the CI (#19049)

* [cpp-qt-client] Just for test

* Fix samples-cpp-qt-client github workflows

* Use only 6.7.1 in CI

* Revert "[cpp-qt-client] Just for test"

This reverts commit c7e19aeb6c.

.github/workflows/samples-cpp-qt-client.yaml

@@ -3,10 +3,10 @@ name: Samples cpp qt client
 on:
   push:
     branches:
-      - 'samples/client/petstore/cpp-qt/**'
+      - "samples/client/petstore/cpp-qt/**"
   pull_request:
     paths:
-      - 'samples/client/petstore/cpp-qt/**'
+      - "samples/client/petstore/cpp-qt/**"
 
 env:
   GRADLE_VERSION: 6.9
@@ -16,9 +16,6 @@ jobs:
     name: Build cpp qt client
     strategy:
       matrix:
-        qt-version:
-          - '5.15.2'
-          - '6.5.3'
         os:
           - ubuntu-latest
           - macOS-latest
@@ -29,8 +26,8 @@ jobs:
       - name: Install Qt
         uses: jurplel/install-qt-action@v4
         with:
-          version: ${{ matrix.qt-version }}
-          tools: ${{ matrix.tools }}
+          version: "6.7.1"
+          target: "desktop"
       - name: Build
         working-directory: "samples/client/petstore/cpp-qt"
         run: cmake . && cmake --build .