Bump importlib-metadata from 5.0.0 to 5.2.0 (#1932)

* Bump importlib-metadata from 5.0.0 to 5.2.0

Bumps [importlib-metadata](https://github.com/python/importlib_metadata) from 5.0.0 to 5.2.0.
- [Release notes](https://github.com/python/importlib_metadata/releases)
- [Changelog](https://github.com/python/importlib_metadata/blob/main/CHANGES.rst)
- [Commits](https://github.com/python/importlib_metadata/compare/v5.0.0...v5.2.0)

---
updated-dependencies:
- dependency-name: importlib-metadata
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

* Update importlib-metadata==5.2.0

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: JonnyWong16 <9099342+JonnyWong16@users.noreply.github.com>

[skip ci]

lib/importlib_metadata/_adapters.py

@@ -1,8 +1,20 @@
+import functools
+import warnings
 import re
 import textwrap
 import email.message
 
 from ._text import FoldedCase
+from ._compat import pypy_partial
+
+
+# Do not remove prior to 2024-01-01 or Python 3.14
+_warn = functools.partial(
+    warnings.warn,
+    "Implicit None on return values is deprecated and will raise KeyErrors.",
+    DeprecationWarning,
+    stacklevel=pypy_partial(2),
+)
 
 
 class Message(email.message.Message):
@@ -39,6 +51,16 @@ class Message(email.message.Message):
     def __iter__(self):
         return super().__iter__()
 
+    def __getitem__(self, item):
+        """
+        Warn users that a ``KeyError`` can be expected when a
+        mising key is supplied. Ref python/importlib_metadata#371.
+        """
+        res = super().__getitem__(item)
+        if res is None:
+            _warn()
+        return res
+
     def _repair_headers(self):
         def redent(value):
             "Correct for RFC822 indentation"