In BUILD-18145 new certificates were requested for ldaptest.10gen.cc. Once the new certificate and certificate authority have been created and provided by the BUILD team, they need to copied into the C driver and the obsolete certificate files need to be removed.

Additionally, as part of CDRIVER-4591, we started to skip the x509 client authentication test on macOS because the latest macOS versions do not support the weak signature algorithm on the legacy certificates. Once the new certificates are available, the test needs to be re-enabled (this can be done around line 105 of .evergreen/scripts/run-auth-tests.sh).