ci: Disable sccache for macOS Ninja Multi-Config nightly job
The job frequently fails during ctest_build, and the log shows
sccache: Compiler killed by signal 9It does not compile much anyway, so disable sccache pending further investigation.
The job frequently fails during ctest_build, and the log shows
sccache: Compiler killed by signal 9It does not compile much anyway, so disable sccache pending further investigation.