[pika] Remove extra description from METADATA.toml (#16109)

Author: donbarbos

stubs/pika/METADATA.toml

@@ -1,10 +1,6 @@
 version = "1.4.*"
 upstream-repository = "https://github.com/pika/pika"
 stub-distribution = "types-pika-ts" # https://github.com/python/typeshed/issues/9246
-extra-description = """\
-The `types-pika` package contains alternate, more complete type stubs, that \
-are maintained outside of typeshed.\
-"""
 optional-dependencies = ["types-gevent"]
 
 [tool.stubtest]