Bump CRT to fix #20424

Bump only the crt and headers to fix ghc#20424

ghc-toolchain.py

@@ -30,7 +30,7 @@ def package(name: str, archs: List[Arch] = ARCHS, ext: str = 'zst') -> Dict[Arch
     return { arch: URLS[arch] for arch in archs }
 
 # Version numbers
-crt_ver = '8.0.0.5905.066f1b3c'
+crt_ver = '9.0.0.6316.acdc7adc9'
 winpthreads_ver = '8.0.0.5904.1278c953'
 gcc_ver = '10.2.0'