chore: fix Update get_validator.sh

Author: TylerGillson

scripts/get_validator.sh

@@ -5,7 +5,7 @@ arch=$(uname -m)
 case "$arch" in
     x86_64) arch="amd64" ;;
     aarch64) arch="arm64" ;;
-    arm64 arch="arm64" ;;
+    arm64) arch="arm64" ;;
     *)
         echo "Unsupported CPU architecture: $arch"
         exit 1