Reinstate older qts so they're not gc'd by cefs

Author: mattgodbolt

bin/yaml/libraries.yaml

@@ -2304,6 +2304,8 @@ libraries:
         url: https://download.qt.io/official_releases/qt/6.8/6.8.0/submodules/qtbase-everywhere-src-6.8.0.tar.xz
       - name: 6.9.0
         url: https://download.qt.io/official_releases/qt/6.9/6.9.0/submodules/qtbase-everywhere-src-6.9.0.tar.xz
+      - name: 6.10.0
+        url: https://download.qt.io/official_releases/qt/6.10/6.10.0/submodules/qtbase-everywhere-src-6.10.0.tar.xz
       type: tarballs
       untar_dir: qtbase-everywhere-src-{{name}}
     quill: