Packaging: Require leapp-framework 6.x + update leapp deps

The leapp actors configuration feature is present since
leapp-framework 6.0. Update the dependencies to ensure the correct
version of the framework is installed on the system.

Also, leapp requirements have been updated - requiring python3-PyYAML
as it requires YAML parser, bumping leapp-framework-dependencies to 6.
Address the change in leapp-deps metapackage to satisfy leapp
dependencies during the upgrade process.

packaging/leapp-repository.spec

@@ -120,7 +120,7 @@ Requires:       leapp-repository-dependencies = %{leapp_repo_deps}
 
 # IMPORTANT: this is capability provided by the leapp framework rpm.
 # Check that 'version' instead of the real framework rpm version.
-Requires:       leapp-framework >= 5.0, leapp-framework < 6
+Requires:       leapp-framework >= 6.0, leapp-framework < 7
 
 # Since we provide sub-commands for the leapp utility, we expect the leapp
 # tool to be installed as well.

packaging/other_specs/leapp-el7toel8-deps.spec

@@ -14,7 +14,7 @@
 
 
 %define leapp_repo_deps  10
-%define leapp_framework_deps 5
+%define leapp_framework_deps 6
 
 # NOTE: the Version contains the %{rhel} macro just for the convenience to
 # have always upgrade path between newer and older deps packages. So for
@@ -112,6 +112,7 @@ Requires:   python3
 Requires:   python3-six
 Requires:   python3-setuptools
 Requires:   python3-requests
+Requires:   python3-PyYAML
 
 
 %description -n %{ldname}