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project: use abstract collection types for read-only params

Tighten parameter annotations on functions that only read or forward
their collection arguments so callers are not constrained to mutable
concrete types:

- get_content, hash_url, and get_last_modified in utils/requests.py:
  headers, params, and data switch from dict[str, str] to
  Mapping[str, str]. niquests' session.get/head still demand a
  MutableMapping for headers, so wrap with dict(headers) at that
  boundary only.
- get_latest_checksum_package, get_latest_location_checksum_package,
  and update_checksum_metadata in special/checksum.py: same
  Mapping[str, str] change for headers and params.
- create_project and update_yarn_ebuild in special/yarn.py:
  yarn_packages switches from set[str] to collections.abc.Set
  (aliased as AbstractSet); the value is only consumed via
  tuple(yarn_packages or []).
- _async_main in main.py: package_names switches from list[str] to
  Sequence[str], matching what get_props already accepts.

Add a NumPy-style docstring to _check_one_package that explicitly
flags the settings.branches[catpkg] = branch write under the settings
parameter, since LivecheckSettings is shared across the call graph
and the mutation persists between packages.

Signed-off-by: Andrew Udvare <audvare@gmail.com>

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