fix: typo (#1304)

prepare_assets.sh

@@ -8,7 +8,7 @@ npm install -g checksum
 
 sum_file() {
   if [[ -f "${1}" ]]; then
-    echo "Calcuating checksum for ${1}"
+    echo "Calculating checksum for ${1}"
     checksum -a sha256 "${1}" > "${1}".sha256
     checksum "${1}" > "${1}".sha1
   fi