set the minimum qt6 version to 6.4

this will be separate from the qt5 removal after release

.ci/Ubuntu22.04/Dockerfile

@@ -9,20 +9,18 @@ RUN apt-get update && \
         file \
         g++ \
         git \
-        libgl-dev \
         liblzma-dev \
         libmariadb-dev-compat \
         libprotobuf-dev \
-        libqt6multimedia6 \
-        libqt6sql6-mysql \
-        libqt6svg6-dev \
-        libqt6websockets6-dev \
+        libqt5multimedia5-plugins \
+        libqt5sql5-mysql \
+        libqt5svg5-dev \
+        libqt5websockets5-dev \
         ninja-build \
         protobuf-compiler \
-        qt6-image-formats-plugins \
-        qt6-l10n-tools \
-        qt6-multimedia-dev \
-        qt6-tools-dev \
-        qt6-tools-dev-tools \
+        qt5-image-formats-plugins \
+        qtmultimedia5-dev \
+        qttools5-dev \
+        qttools5-dev-tools \
     && apt-get clean \
     && rm -rf /var/lib/apt/lists/*

cmake/FindQtRuntime.cmake

@@ -42,7 +42,7 @@ list(REMOVE_DUPLICATES REQUIRED_QT_COMPONENTS)
 if(NOT FORCE_USE_QT5)
   # Linguist is now a component in Qt6 instead of an external package
   find_package(
-    Qt6 6.2.3
+    Qt6 6.4.2
     COMPONENTS ${REQUIRED_QT_COMPONENTS} Linguist
     QUIET HINTS ${Qt6_DIR}
   )