update tag in update.sh to v1.16.0-rc1

Author: sam0x17

support/procedural-fork/update.sh

@@ -5,7 +5,7 @@ set -e
 
 # Set the repository and tag
 REPO_URL="[email protected]:paritytech/polkadot-sdk.git"
-POLKADOT_SDK_TAG="v1.10.0-rc3"
+POLKADOT_SDK_TAG="v1.16.0-rc1"
 
 # Create a temporary directory for cloning
 TMP_DIR=$(mktemp -d)