ci: Use previous sarif-tools release due to issue in latest release.

The just released v3.0 of the sarif tools do not work as
expected when comparing results. Temporarily force pip
to install the 2.0 release until this is fixed.

Acked-by: Aaron Conole <aconole@redhat.com>
Acked-by: Simon Horman <horms@ovn.org>
Signed-off-by: Eelco Chaudron <echaudro@redhat.com>

.ci/linux-prepare.sh

@@ -23,7 +23,7 @@ cd ..
 #     https://github.com/pypa/pip/issues/10655
 pip3 install --disable-pip-version-check --user wheel
 pip3 install --disable-pip-version-check --user \
-    flake8 netaddr pyparsing sarif-tools sphinx setuptools
+    flake8 netaddr pyparsing sarif-tools==2.0.0 sphinx setuptools
 
 # Install python test dependencies
 pip3 install -r python/test_requirements.txt