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/CopyContext.py

@@ -1,4 +1,4 @@
-from typing import Self
+from typing import Any, Self
 
 from .FileContext import FileContext
 from .Uri import Uri
@@ -9,7 +9,7 @@ class CopyContext:
         self,
         src: Uri | str | FileContext,
         dst: Uri | str | FileContext,
-        chroot = False
+        chroot: bool = False,
     ) -> None:
 
         def __uri(ctx: FileContext | Uri | str) -> Uri | str:
@@ -43,7 +43,7 @@ class CopyContext:
         await self.__dst.open()
         return self
 
-    async def __aexit__(self, exc_type, exc, tb):
+    async def __aexit__(self, exc_type: Any, exc: Any, tb: Any) -> None:
         if self.__src is not None:
             await self.__src.close()
             self.__src = None