[Sanitizers][Darwin] Bump up DEFAULT_SANITIZER_MIN_OSX_VERSION (#86035)

The greendragon was recently moved and now it runs on somewhat newer
macOS
version - which breaks some sanitizers tests

rdar://125052915

Co-authored-by: Mariusz Borsa <m_borsa@apple.com>
GitOrigin-RevId: 19268ac55106834701b1c41acded4d413a3502e9
1 file changed