build(deps): drop spurious importlib-metadata dependency

importlib-metadata was declared as a direct dependency (^6.6) solely as a
fallback for the stdlib importlib.metadata import in connect/client/version.py.

Since the project requires Python >=3.9 and importlib.metadata has been in the
standard library since 3.8, the except branch never executed and the <7 ceiling
imposed by the caret was entirely artificial.

Remove the dependency from pyproject.toml and the try/except fallback in
version.py (now importing directly from importlib.metadata). importlib-metadata
remains in the lock at 6.11.0 as a transitive dependency of mkdocs (python<3.10),
so requirements/docs.txt is unaffected.

LITE-34447

Author: pcaro

connect/client/version.py

@@ -5,10 +5,7 @@
 #
 # Copyright (c) 2023 Ingram Micro. All Rights Reserved.
 #
-try:
-    from importlib.metadata import version
-except Exception:
-    from importlib_metadata import version
+from importlib.metadata import version
 
 
 def get_version():