Marked the client auth table drop migration as irreversible

no issue

- bumps `knex-migrator` so it supports irreversible migrations
- marks the `03-drop-client-auth` migration as irreversible because it destroys data that is not recoverable and is required for earlier versions of Ghost to function

core/server/data/migrations/versions/3.0/03-drop-client-auth-tables.js

@@ -6,6 +6,10 @@ const tables = [
     'clients'
 ];
 
+module.exports.config = {
+    irreversible: true
+};
+
 module.exports.up = (options) => {
     const connection = options.connection;
 
@@ -26,5 +30,5 @@ module.exports.up = (options) => {
 // the schemas for the deleted tables no longer exist so there's nothing for
 // `commands.createTable` to draw from for the table structure
 module.exports.down = () => {
-    return Promise.resolve();
+    return Promise.reject();
 };

package.json

@@ -89,7 +89,7 @@
     "jsonwebtoken": "8.5.1",
     "keypair": "1.0.1",
     "knex": "0.19.4",
-    "knex-migrator": "3.3.3",
+    "knex-migrator": "3.4.0",
     "lodash": "4.17.15",
     "markdown-it": "9.1.0",
     "markdown-it-footnote": "3.0.2",

yarn.lock

@@ -4675,10 +4675,10 @@ kind-of@^6.0.0, kind-of@^6.0.2:
   resolved "https://registry.yarnpkg.com/kind-of/-/kind-of-6.0.2.tgz#01146b36a6218e64e58f3a8d66de5d7fc6f6d051"
   integrity sha512-s5kLOcnH0XqDO+FvuaLX8DDjZ18CGFk7VygH40QoKPUQhW4e2rvM0rwUq0t8IQDOwYSeLK01U90OjzBTme2QqA==
 
-knex-migrator@3.3.3:
-  version "3.3.3"
-  resolved "https://registry.yarnpkg.com/knex-migrator/-/knex-migrator-3.3.3.tgz#a080f98ff3b6947d9a6ea7af427f744971f388d3"
-  integrity sha512-GPKxmI9jeQlFLMHGZktM7fjckm0W+RUHN4SIq4lms40jNw9XiPK9LH0biUczIeM0hevqEFWEdfbbKU5zLVgaBw==
+knex-migrator@3.4.0:
+  version "3.4.0"
+  resolved "https://registry.yarnpkg.com/knex-migrator/-/knex-migrator-3.4.0.tgz#c110236fb1efe1c3b46d4bd7521abeae80df7497"
+  integrity sha512-Ay9Fpo/lxRQlibCT5dNaiyG49Jw4oSMdbm6fqf7BwriRkBwuQKyteSNVqAIhGMg0WdRjCeeBLoGlnwVXU/5QsA==
   dependencies:
     bluebird "^3.5.3"
     commander "^2.19.0"