framework: update checkout.

Submodule framework ba54771..ec92a1e:
  > packages/export: export_git: properly handle remotes, now by cloning from the src's origin.
  > scripts/shell.utils: stage_lister_directory: do not inherit stage lister for subsession calls on directories.
  > scripts/urlops: add functions for URL escaping operations (rawurlencode and rawurldecode).
  > scripts/shell: improve debug (use single quotes).
  > scripts/shell: runner: (hopefully) improve error handling of the invoked command.
  > scripts/shell: drop selective stage list.
  > scripts/shell.utils: stage_lister_directory: fix quoting in call of subsession runner.
  > scripts/parser: build_cstyle_call: escape parentheses.
  > scripts/parser: parse_cstyle_call: fix escaping in case of no argument.