Fix mypy CI: add per-module ignore for requests stubs

The global ignore_missing_imports does not suppress import-untyped
for inline imports. Add explicit per-module override for requests.

Author: lavr

setup.cfg

@@ -20,6 +20,10 @@ ignore_errors = true
 [mypy-emails.backend.smtp.client]
 disable_error_code = attr-defined, no-redef
 
+# Optional dependency stubs
+[mypy-requests.*]
+ignore_missing_imports = true
+
 # Optional dependency, not always installed
 [mypy-emails.template.*]
 ignore_errors = true