This patch does the following:
1. Add the InvalidName class (otherwise, jupyterlab >= 4.5.7 crashes on Slackware 15.0)
2. Replace the canonicalize_name definition (I am using the code from packaging 26.2)

--- a/jupyterlab/extensions/pypi.py
+++ b/jupyterlab/extensions/pypi.py
@@ -19,14 +19,13 @@
 from pathlib import Path
 from subprocess import CalledProcessError, run
 from tarfile import TarFile
-from typing import Any, Callable, Optional, Union
+from typing import Any, Callable, NewType, Optional, Union
 from urllib.parse import urlparse
 from zipfile import ZipFile
 
 import httpx
 import tornado
 from async_lru import alru_cache
-from packaging.utils import InvalidName, canonicalize_name
 from packaging.version import InvalidVersion, Version
 from packaging.version import parse as parse_version
 from traitlets import CFloat, CInt, Unicode, config, observe
@@ -44,6 +43,23 @@
     ExtensionPackage,
 )
 
+NormalizedName = NewType("NormalizedName", str)
+
+
+class InvalidName(ValueError):
+    """
+    An invalid distribution name; users should refer to the packaging user guide.
+    """
+
+
+def canonicalize_name(name: str, *, validate: bool = False) -> NormalizedName:
+    if validate and not _validate_regex.fullmatch(name):
+        raise InvalidName(f"name is invalid: {name!r}")
+    value = name.lower().replace("_", "-").replace(".", "-")
+    while "--" in value:
+        value = value.replace("--", "-")
+    return cast("NormalizedName", value)
+
 
 class ProxiedTransport(xmlrpc.client.Transport):
     def set_proxy(self, host, port=None, headers=None):