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/cmds/secrets/lib/FilesContext.py

@@ -23,7 +23,11 @@ class FilesContext:
     def ctx(self) -> FileContext:
         return self.__ctx
 
-    async def _read_key_value_file(self, path: str, throw = False) -> dict[str, str]:
+    async def _read_key_value_file(
+        self,
+        path: str,
+        throw: bool = False,
+    ) -> dict[str, str]:
         ret: dict[str, str] = {}
         try:
             result = await self.ctx.get(path)