Release script fixups (pantsbuild#15875)

* Remove Greg from expected maintainers
* Remove Apple Silicon prompt

CI does this for us now. Eric is freeeeeeee.
# Building wheels and fs_util will be skipped. Delete if not intended.
[ci skip-build-wheels]

build-support/bin/_release_helper.py

@@ -70,7 +70,7 @@
 
 _expected_owners = {"benjyw", "John.Sirois", "stuhood"}
 
-_expected_maintainers = {"EricArellano", "gshuflin", "illicitonion", "wisechengyi"}
+_expected_maintainers = {"EricArellano", "illicitonion", "wisechengyi"}
 
 
 # Disable the Pants repository-internal internal_plugins.test_lockfile_fixtures plugin because
@@ -900,7 +900,6 @@ def publish() -> None:
     upload_wheels_via_twine()
     tag_release()
     banner("Successfully released to PyPI and GitHub")
-    prompt_apple_silicon()
     prompt_to_generate_docs()
 
 
@@ -1092,22 +1091,6 @@ def prompt_artifact_freshness() -> None:
         print("No stale artifacts detected.")
 
 
-def prompt_apple_silicon() -> None:
-    input(
-        softwrap(
-            f"""
-            We need to release for Apple Silicon. Please message Eric on Slack asking to release
-            for {CONSTANTS.pants_stable_version}.
-
-            (You do not need to wait for Eric to finish their part. You can continue in the release
-            process once you've messaged them.)
-
-            Hit enter when you've messaged Eric:
-            """
-        )
-    )
-
-
 def prompt_to_generate_docs() -> None:
     has_docs_access = input(
         softwrap(