mgr/dashboard: Updated test dependencies

Seemed that the test dependencies was separated in two different requirements files
one for the testing and one for linting. Added the JWT dependency in the linting file
as well.

Signed-off-by: Daniel Persson <[email protected]>

Author: kalaspuffar

src/pybind/mgr/dashboard/requirements-lint.txt

@@ -9,3 +9,4 @@ autopep8==1.5.7
 pyfakefs==4.5.0
 isort==5.5.3
 jsonschema~=4.0
+PyJWT~=2.0