fix: upgrade knex to 0.21.6

This reduces a overly noisy warning during tests: https://github.com/knex/knex/pull/3936

plugins/auth-backend/package.json

@@ -35,7 +35,7 @@
     "helmet": "^4.0.0",
     "jose": "^1.27.1",
     "jwt-decode": "2.2.0",
-    "knex": "^0.21.1",
+    "knex": "^0.21.6",
     "moment": "^2.26.0",
     "morgan": "^1.10.0",
     "passport": "^0.4.1",

plugins/catalog-backend/package.json

@@ -32,7 +32,7 @@
     "express-promise-router": "^3.0.3",
     "fs-extra": "^9.0.0",
     "git-url-parse": "^11.4.0",
-    "knex": "^0.21.1",
+    "knex": "^0.21.6",
     "ldapjs": "^2.2.0",
     "lodash": "^4.17.15",
     "morgan": "^1.10.0",

plugins/techdocs-backend/package.json

@@ -32,7 +32,7 @@
     "express-promise-router": "^3.0.3",
     "fs-extra": "^9.0.1",
     "git-url-parse": "^11.4.0",
-    "knex": "^0.21.1",
+    "knex": "^0.21.6",
     "nodegit": "^0.27.0",
     "winston": "^3.2.1"
   },