PluginSpecs: Change URLs from http:// to https://

Avoid the redirect that is inevitable nowerdays.

Also, change necessitas.kde.org to www.qt.io, since the orgininal page
is offline.

Change-Id: Ib1823f0df97d2df87822fd2bb7552e2f2c7e971e
Reviewed-by: Tim Jenssen <tim.jenssen@qt.io>

src/plugins/mesonprojectmanager/MesonProjectManager.json.in

@@ -16,6 +16,6 @@
     ],
     "Category" : "Build Systems",
     "Description" : "Meson support.",
-    "Url" : "http://www.mesonbuild.com",
+    "Url" : "https://www.mesonbuild.com",
     ${IDE_PLUGIN_DEPENDENCIES}
 }