Do not try to upgrade the image's apt-installed PyJWT

The notebooks job installs with -U, which wants to replace PyJWT 2.7.0. That copy
came from the image's debian packages, so it has no RECORD file and uv refuses:

  error: uninstall-no-record-file
  Cannot uninstall PyJWT 2.7.0

--ignore-installed leaves it in place. The image shipping PyJWT via apt rather
than pip is the underlying issue.

Author: bhimrazy

.lightning/workflows/notebooks.yaml

@@ -27,7 +27,9 @@ run: |
   bash scripts/remove-torch-lines.sh requirements/base.txt
   cat requirements/base.txt
   # double check on test requirements
-  pip install -q -U -r requirements/base.txt -r requirements/notebooks.txt
+  # PyJWT comes from the image's apt packages, so it has no RECORD and cannot be uninstalled
+  # to make way for an -U upgrade; leave the installed one alone.
+  pip install -q -U --ignore-installed PyJWT -r requirements/base.txt -r requirements/notebooks.txt
   # install this package
   pip install -e .