ci-bootstrap: Stick to 15.2 because current default download of Cover…

…ity cannot support higher

 - https://sig-synopsys.my.site.com/community/s/article/coverity-capture-failed-for-Xcode-15-4-version-on-Mac-OS
 - https://documentation.blackduck.com/bundle/coverity-docs/page/webhelp-files/relnotes_latest.html#:~:text=Bug%20fixes-,CAP%2D2296,-Reported%20in%20version

Add clang patch for 32-bit kexts