🐛 Fixed infinite scroll on posts/pages lists in admin

closes https://github.com/TryGhost/Ghost/issues/11608

- reverts `ember-source` to a working version and temporarily blocks renovate from auto-updating
- ember-infinity issue https://github.com/ember-infinity/ember-infinity/issues/421
- related ember-source issue https://github.com/emberjs/ember.js/issues/18750

ghost/admin/package.json

@@ -93,7 +93,7 @@
     "ember-route-action-helper": "2.0.8",
     "ember-simple-auth": "2.1.1",
     "ember-sinon": "4.1.1",
-    "ember-source": "3.16.3",
+    "ember-source": "3.16.1",
     "ember-sticky-element": "0.2.3",
     "ember-svg-jar": "2.2.3",
     "ember-test-selectors": "3.0.0",

ghost/admin/renovate.json

@@ -4,6 +4,7 @@
     "@tryghost:automergeSilentTestLintNonMajor"
   ],
   "ignoreDeps": [
+    "ember-source",
     "ember-drag-drop",
     "normalize.css",
     "validator",

ghost/admin/yarn.lock

@@ -6008,10 +6008,10 @@ ember-source-channel-url@^2.0.1:
   dependencies:
     got "^8.0.1"
 
-ember-source@3.16.3:
-  version "3.16.3"
-  resolved "https://registry.yarnpkg.com/ember-source/-/ember-source-3.16.3.tgz#080ded36d6b43ed1ee8e9a13ed4cebf27a50db6a"
-  integrity sha512-A5IuTBDnxM4zK5IOaoePOchmgaKm4iYuYfQZVsvuPoczm89SBTKuQZnsXFp2ZI8Sc17ALm1Euc9Lc10TNy2KXw==
+ember-source@3.16.1:
+  version "3.16.1"
+  resolved "https://registry.yarnpkg.com/ember-source/-/ember-source-3.16.1.tgz#997f51c2b74620906d2a8111089b6e894b6165e6"
+  integrity sha512-4cYfQ+DsqeSTqG0RztuTsh8d8p0XdeIaPWe9Ol229GhQjM1JgpjQNTXGJDTIB8FfbAxycPlCwIk2qXygA+pFsA==
   dependencies:
     "@babel/helper-module-imports" "^7.0.0"
     "@babel/plugin-transform-block-scoping" "^7.6.2"