Conan: Use recipe revision mode for 'python_requires'

By default Conan uses 'minor_mode' policy for 'python_requires'
dependencies. This causes updates in 'qt-conan-common' package not to
land into users when invoking e.g. "$conan instal .. --update".

Fix this by enforcing recipe revision mode so any changes to
'qt-conan-common' recipe is received by the clients when updating
packages.

Pick-to: 6.2
Change-Id: I225965aa76c39552bd4adc93d7e68e0ae0b38d56
Reviewed-by: Toni Saario <toni.saario@qt.io>

conanfile.py

@@ -441,6 +441,8 @@ class QtBase(ConanFile):
     def package_id(self):
         # https://docs.conan.io/en/latest/creating_packages/define_abi_compatibility.html
         self.info.requires.package_revision_mode()
+        # Enable 'qt-conan-common' updates on client side with $conan install .. --update
+        self.info.python_requires.recipe_revision_mode()
 
         # Remove those configure(.bat) options which should not affect package_id.
         # These point to local file system paths and in order to re-use pre-built