Fix pyrig)t errors in jsonschema.exceptions

pyright flagged Self being used without a
`cls: type[Self]` annotation on a classmethod. Fix with the
appropriate annotation.

It also notes the use of Container as an Any-Generic. Fix by making it
`Container[str]` as appropriate in this case.

stubs/jsonschema/jsonschema/exceptions.pyi

@@ -37,7 +37,7 @@ class _Error(Exception):
         parent: _Error | None = ...,
     ) -> None: ...
     @classmethod
-    def create_from(cls, other: _Error) -> Self: ...
+    def create_from(cls: type[Self], other: _Error) -> Self: ...
     @property
     def absolute_path(self) -> Sequence[str]: ...
     @property
@@ -78,7 +78,7 @@ class ErrorTree:
     @property
     def total_errors(self): ...
 
-def by_relevance(weak: Container = ..., strong: Container = ...) -> RelevanceFuncType: ...
+def by_relevance(weak: Container[str] = ..., strong: Container[str] = ...) -> RelevanceFuncType: ...
 
 relevance: RelevanceFuncType