fix: latest Rust compiler check

- fix latest Rust compiler check. Seems like upstream changed a little
  bit format of the message in the commands

Tested:
- Local test

Author: zamazan4ik

latest.sh

@@ -8,8 +8,9 @@ source /cargo/env
 
 rustup toolchain install stable --profile=minimal
 STABLE=$(rustup check | grep stable | grep -E "[0-9]+\.[0-9]+\.[0-9]+" -o)
-DEFAULT=$(rustup show | grep -m 1 default | grep -E "[0-9]+\.[0-9]+\.[0-9]+" -o)
+DEFAULT=$(rustup show | grep -m 1 rustc | grep -E "[0-9]+\.[0-9]+\.[0-9]+" -o)
 
 if [ "${STABLE}" == "${DEFAULT}" ]; then exit 0
     else exit 1
 fi
+