Update pins for MSRV compatibility

Author: xtqqczze

.github/workflows/main.yml

@@ -72,6 +72,7 @@ jobs:
         cargo update --package=proc-macro2 --precise=1.0.103
         cargo update --package=unicode-ident --precise=1.0.22
         cargo update --package=ryu --precise=1.0.20
+        cargo update --package=futures-task --precise=0.3.31
 
     - run: >
         rustup target add