build-unit-test-docker: update to clang-18

Update the CI docker container to use clang-18.

Change-Id: Iea0776aaa7edd483fa395e23de25ebf5a6288f71
Signed-off-by: Ed Tanous <ed@tanous.net>
Signed-off-by: Patrick Williams <patrick@stwcx.xyz>
1 file changed