[argparse] Replace some Sequence instances with Iterable

[srittau]

No description provided.

[github-actions]

Diff from mypy_primer, showing the effect of this PR on open source code:

materialize (https://github.com/MaterializeInc/materialize)
- misc/python/materialize/mzcompose/composition.py:101: note:          def parse_known_args(self, args: Sequence[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
+ misc/python/materialize/mzcompose/composition.py:101: note:          def parse_known_args(self, args: Iterable[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
- misc/python/materialize/mzcompose/composition.py:101: note:          def [_N] parse_known_args(self, args: Sequence[str] | None, namespace: _N) -> tuple[_N, list[str]]
+ misc/python/materialize/mzcompose/composition.py:101: note:          def [_N] parse_known_args(self, args: Iterable[str] | None, namespace: _N) -> tuple[_N, list[str]]
- misc/python/materialize/cli/mzcompose.py:1044: note:          def parse_known_args(self, args: Sequence[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1044: note:          def parse_known_args(self, args: Iterable[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
- misc/python/materialize/cli/mzcompose.py:1044: note:          def [_N] parse_known_args(self, args: Sequence[str] | None, namespace: _N) -> tuple[_N, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1044: note:          def [_N] parse_known_args(self, args: Iterable[str] | None, namespace: _N) -> tuple[_N, list[str]]
- misc/python/materialize/cli/mzcompose.py:1056: note:          def parse_known_args(self, args: Sequence[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1056: note:          def parse_known_args(self, args: Iterable[str] | None = ..., namespace: None = ...) -> tuple[Namespace, list[str]]
- misc/python/materialize/cli/mzcompose.py:1056: note:          def [_N] parse_known_args(self, args: Sequence[str] | None, namespace: _N) -> tuple[_N, list[str]]
+ misc/python/materialize/cli/mzcompose.py:1056: note:          def [_N] parse_known_args(self, args: Iterable[str] | None, namespace: _N) -> tuple[_N, list[str]]
- misc/python/materialize/cli/scratch/__main__.py:101: error: Argument "aliases" to "add_parser" of "_SubParsersAction" has incompatible type "str | Callable[[Any], Any] | Callable[[], None] | Callable[[ArgumentParser], None] | Callable[[Namespace], None] | list[str]"; expected "Sequence[str]"  [arg-type]
+ misc/python/materialize/cli/scratch/__main__.py:101: error: Argument "aliases" to "add_parser" of "_SubParsersAction" has incompatible type "str | Callable[[Any], Any] | Callable[[], None] | Callable[[ArgumentParser], None] | Callable[[Namespace], None] | list[str]"; expected "Iterable[str]"  [arg-type]

[brianschubert]

This one needs to be twice iterable (so e.g. an iterator won't work at runtime). It's a pity there isn't better way to express that in the current type system