fix: add PyJWT to requirements.txt for CI pylint

PyJWT is declared as a dependency in setup.py but was missing from
requirements.txt. The CI pylint job installs from requirements.txt
only, causing E0401 import-error for the jwt module.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: cloudsmith-iduffy

requirements.txt

@@ -115,6 +115,8 @@ packaging==26.0
     #   build
     #   pytest
     #   wheel
+pyjwt==2.12.1
+    # via cloudsmith-cli (setup.py)
 pip-tools==7.5.2
     # via -r requirements.in
 platformdirs==4.5.1