Fix updater bug due to missing newline at EOF (#14713)

requirements/requirements.txt

@@ -119,6 +119,7 @@ django==4.2.6
     #   djangorestframework
     #   drf-spectacular
     #   social-auth-app-django
+    # via -r /awx_devel/requirements/requirements_git.txt
 django-auth-ldap==4.1.0
     # via
     #   -r /awx_devel/requirements/requirements.in

requirements/updater.sh

@@ -76,6 +76,12 @@ main() {
       exit
   fi
 
+  if [[ ! -z "$(tail -c 1 "${requirements_git}")" ]]
+  then
+      echo "No newline at end of ${requirements_git}, please add one"
+      exit
+  fi
+
   cp -vf requirements.txt "${_tmp}"
   cd "${_tmp}"