fix: typo, .message doesn't exist

backport.sh

@@ -24,7 +24,7 @@ http_post() {
   if [[ $(echo "${result}" |jq -r .http_code) != "2*" ]]
   then
     local message
-    message=$(echo "${result}"| jq -r -s 'add | (.http_code|tostring) + ": " + .message + " effective url: " + .url_effective')
+    message=$(echo "${result}"| jq -r -s 'add | (.http_code|tostring) + ", effective url: " + .url_effective')
     echo "::error::Error in HTTP POST to ${url} of \`${json}\`: ${message}"
     exit 1
   fi

spec/backport_spec.sh

@@ -520,7 +520,7 @@ EOF
       The output should equal '::debug::curl verbose output
 ::debug::curl verbose output (second line)
 ::debug::result={"http_code":401,"url_effective":"url"}
-::error::Error in HTTP POST to url of '"\`"'{"json":"data"}'"\`"': 401:  effective url: url'
+::error::Error in HTTP POST to url of '"\`"'{"json":"data"}'"\`"': 401, effective url: url'
       The status should equal 1
     End
   End