Remove unused 1.73.0{b,} compilers am: 7c5221ccb1

Original change: https://android-review.googlesource.com/c/platform/prebuilts/rust/+/3109352

Change-Id: I303298a8b4e0b740a71d6496192f947080889cf5
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>
1 file changed