workflows: compliance: Adapt to use use python 3.12

With the newer ubuntu being used, newer python packeges
must be used:

- Upgrade lxml to 4.9.4 because is 4.9.1 is not supported.
- Install unidiff. It is being used.

Signed-off-by: Rubin Gerritsen <rubin.gerritsen@nordicsemi.no>

.github/workflows/compliance.yml

@@ -28,8 +28,8 @@ jobs:
         pip3 install  -U wheel
         # TODO: add yamllint to scripts/requirements-fixed.txt
         pip3 install -U yamllint
-        pip3 install lxml==4.9.1
-        pip3 install  -U python-magic junitparser==2.8.0 gitlint pylint pykwalify
+        pip3 install lxml==4.9.4
+        pip3 install  -U python-magic junitparser==2.8.0 gitlint pylint pykwalify unidiff
         pip3 install --user -U west
         pip3 show -f west