fix pkg_resources api deprecated warning

Signed-off-by: zhuwenxing <wenxing.zhu@zilliz.com>

Author: zhuwenxing

Diff for: pymilvus/client/__init__.py

@@ -2,17 +2,16 @@
 import re
 import subprocess
 from contextlib import suppress
-
-from pkg_resources import DistributionNotFound, get_distribution
+from importlib.metadata import version, PackageNotFoundError
 
 log = logging.getLogger(__name__)
 
 
 __version__ = "0.0.0.dev"
 
 
-with suppress(DistributionNotFound):
-    __version__ = get_distribution("pymilvus").version
+with suppress(PackageNotFoundError):
+    __version__ = version("pymilvus")
 
 
 def get_commit(version: str = "", short: bool = True) -> str: