Fix type check with latest mypy/typeshed

The following commit defined a return type hint for
getElementsByTagName:

3fc2f27990 (diff-f451f731d037ef9d79347194490b32ba613798ea7eaa2c160351a69625f05e08R150)

It defined the return type as a list of Node, while this code expects a
list of Element (Element is a subtype of Node).

Given that one would expect a getElements method to return
specifically *elements* and not other types of node, I think the
typeshed change may be incorrect, but it's hard to be sure since the
stdlib docs themselves are ambiguous.

Suppress it for now to unblock dependency updates.

repo_autoindex/_impl/yum.py

@@ -23,7 +23,7 @@ def assert_repodata_ok(condition: Any, msg: str):
 
 
 def get_tag(elem: Element, name: str) -> Element:
-    elems: list[Element] = elem.getElementsByTagName(name)
+    elems: list[Element] = elem.getElementsByTagName(name)  # type: ignore
     assert_repodata_ok(len(elems) == 1, f"expected exactly one {name} tag")
     return elems[0]