internal/subprocess(refactor[typing]): Align pass_fds with typeshed

why: Use Collection[int] to match Python's official typeshed, allowing
sets and frozensets which subprocess accepts at runtime.
what:
- Change pass_fds type from Sequence[int] to Collection[int]
- Update both subprocess.py and run.py

Author: tony

src/libvcs/_internal/run.py

@@ -19,7 +19,7 @@
 import sys
 import time
 import typing as t
-from collections.abc import Iterable, Mapping, MutableMapping, Sequence
+from collections.abc import Collection, Iterable, Mapping, MutableMapping, Sequence
 
 from libvcs import exc
 from libvcs._internal.types import StrOrBytesPath
@@ -139,7 +139,7 @@ def run(
     creationflags: int = 0,
     restore_signals: bool = True,
     start_new_session: bool = False,
-    pass_fds: Sequence[int] = (),
+    pass_fds: Collection[int] = (),
     *,
     encoding: str | None = None,
     errors: str | None = None,

src/libvcs/_internal/subprocess.py

@@ -44,7 +44,7 @@
 import subprocess
 import sys
 import typing as t
-from collections.abc import Mapping, Sequence
+from collections.abc import Collection, Mapping, Sequence
 
 from libvcs._internal.types import StrOrBytesPath
 
@@ -108,7 +108,7 @@ class SubprocessCommand(SkipDefaultFieldsReprMixin):
     # POSIX-only
     restore_signals: bool = True
     start_new_session: bool = False
-    pass_fds: Sequence[int] = ()
+    pass_fds: Collection[int] = ()
     umask: int = -1
     pipesize: int = -1
     user: str | None = None