chore(CI): AppVeyor FTBFS, bump GH Action Qt version

.github/workflows/macos.yml

@@ -12,7 +12,7 @@ jobs:
     - name: Install Qt
       uses: jurplel/install-qt-action@v4
       with:
-        version: '6.8.1'
+        version: '6.8.3'
         modules: 'qtimageformats'
     - name: Install Conan and Dependencies
       id: conan

.github/workflows/windows.yml

@@ -8,7 +8,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - qt_ver: '6.8.2'
+          - qt_ver: '6.8.3'
             vs: '2022'
             aqt_arch: 'win64_msvc2022_64'
             msvc_arch: 'x64'
@@ -44,7 +44,7 @@ jobs:
     strategy:
       matrix:
         include:
-          - qt_ver: '6.8.2'
+          - qt_ver: '6.8.3'
             vs: '2022'
             aqt_arch: 'win64_msvc2022_64'
             msvc_arch: 'x64'