App, cmds, lib: Fix Any returns from typed functions

Add type annotations and casts to functions that were returning Any
where a specific type was declared, satisfying the new warn_return_any
mypy rule.

Fixes:
- log.py: get_caller_pos return type via cast
- AsyncRunner.py: cast T for fut.result()
- util.py: cast for getattr result, str() for args.username
- FileContext.py: verbose_default bool annotation
- SSHClient.py: cast SSHClient for dynamic import
- lib/App.py: cast ArgumentParser, add return types to inner funcs
- pm/rpm.py, dpkg.py: cast Iterable[Package]
- App.py: cast for self.args.func(), add return types to inner funcs
- BaseCmdPkgRelations.py: cast str for args.delimiter

Assisted-by: unsloth/Qwen3.6-35B-A3B-GGUF:IQ4_NL and pi.dev 0.81.1
Signed-off-by: Jan Lindemann <jan@janware.com>

src/python/jw/pkg/lib/pm/dpkg.py

@@ -1,6 +1,6 @@
 from __future__ import annotations
 
-from typing import TYPE_CHECKING, Iterable
+from typing import TYPE_CHECKING, Iterable, cast
 
 if TYPE_CHECKING:
     from ..ExecContext import ExecContext
@@ -59,7 +59,7 @@ async def query_packages(names: Iterable[str] = [],
     )
     # dpkg-query -W -f='${binary:Package}|${Maintainer}| ... \n'
     specs = await run_dpkg_query(['-W', '-f=' + fmt_str, *names], sudo = False, ec = ec)
-    return Package.parse_specs_str(specs)
+    return cast('Iterable[Package]', Package.parse_specs_str(specs))
 
 async def list_files(pkg: str, ec: ExecContext | None = None) -> list[str]:
     file_list_str = await run_dpkg(['-L', pkg], sudo = False, ec = ec)