Update mypy to 1.19.1 (#15235)

Skip gdb stubtest for now

Author: srittau

requirements-tests.txt

@@ -1,6 +1,6 @@
 # Type checkers that we test our stubs against. These should always
 # be pinned to a specific version to make failure reproducible.
-mypy==1.18.2
+mypy==1.19.1
 pyright==1.1.408
 
 # Libraries used by our various scripts.

stubs/gdb/METADATA.toml

@@ -11,5 +11,6 @@ extra_description = """\
 """
 
 [tool.stubtest]
+skip = true                # https://github.com/python/typeshed/issues/15236
 ci_platforms = ["linux"]
 apt_dependencies = ["gdb"]