ci: relax ahash msrv pin

Author: robjtede

justfile

@@ -4,7 +4,6 @@ _list:
 # Downgrade dev-dependencies necessary to run MSRV checks/tests.
 [private]
 downgrade-msrv:
-    cargo update -p=ahash --precise=0.8.7
     cargo update -p=ciborium --precise=0.2.1
     cargo update -p=ciborium-ll --precise=0.2.1
     cargo update -p=time --precise=0.3.16