Merge "Bump the default from gnu++17 to gnu++20." into main am: 37d6943f am:...

Merge "Bump the default from gnu++17 to gnu++20." into main am: 37d6943f am: 803a14a0 am: c126cbd5

Original change: https://android-review.googlesource.com/c/platform/build/soong/+/2760825



Change-Id: I6a5a8694bc91b605a70381d8ca737173f3d9209b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>