CI: Use Qt 5.15.18 for static builds on Linux

Author: Wohlstand

.github/workflows/ubuntu-ci.yml

@@ -30,15 +30,15 @@ jobs:
             os: ubuntu-latest,
             container: "ghcr.io/wohlsoft/wohlsoft-ci-ubuntu1804-qt5-static:latest",
             generator: "Ninja",
-            extra_path: "/home/runner/Qt/5.15.10_static/bin",
+            extra_path: "/home/runner/Qt/5.15.18_static/bin",
             build_type: "Release",
             upload_directory: "www/ubuntu-18-04/",
             versions_upload_directory: "www/_versions/",
-            qt_download: "https://wohlsoft.ru/docs/Software/QtBuilds/qt-5.15.10-static-ubuntu-18-04-x64-gcc8.tar.bz2",
+            qt_download: "https://wohlsoft.ru/docs/Software/QtBuilds/qt-5.15.18-static-ubuntu-18-04-x64-gcc8.tar.bz2",
             qt_install_dir: "/home/runner/Qt",
-            qt_ver: "5.15.10_static",
-            qt_dir: "/home/runner/Qt/5.15.10_static/bin",
-            qt_lib_dir: "/home/runner/Qt/5.15.10_static/lib",
+            qt_ver: "5.15.18_static",
+            qt_dir: "/home/runner/Qt/5.15.18_static/bin",
+            qt_lib_dir: "/home/runner/Qt/5.15.18_static/lib",
             readline6_download: "https://wohlsoft.ru/docs/Software/libreadline6_6.3-8_amd64-ubuntu1804.deb",
             lftp_download: "https://wohlsoft.ru/docs/Software/lftp_4.9.1-1_amd64-ubuntu1604.deb",