Upgrade Node to v14.11

Changes:

- `package.json` field `engines.node` - added, did not previously exist
- `.nvmrc` - created
- `.circleci/config.yml` Docker image for `container_config_node` - Docker updated, previously: `circleci/node:8-browsers`

.circleci/config.yml

@@ -3,10 +3,10 @@
 
 references:
 
-  container_config_node8: &container_config_node8
+  container_config_node14: &container_config_node14
     working_directory: ~/project/build
     docker:
-      - image: circleci/node:8-browsers
+      - image: circleci/node:14-browsers
 
   workspace_root: &workspace_root
     ~/project
@@ -55,7 +55,7 @@ version: 2
 jobs:
 
   build:
-    <<: *container_config_node8
+    <<: *container_config_node14
     steps:
       - checkout
       - run:
@@ -88,7 +88,7 @@ jobs:
             - build
 
   test:
-    <<: *container_config_node8
+    <<: *container_config_node14
     steps:
       - *attach_workspace
       - run:
@@ -104,7 +104,7 @@ jobs:
           destination: test-results
 
   publish:
-    <<: *container_config_node8
+    <<: *container_config_node14
     steps:
       - *attach_workspace
       - run:

.nvmrc

@@ -0,0 +1 @@
+14.11

package.json

@@ -25,5 +25,8 @@
     "prepush": "make verify -j3",
     "commitmsg": "node_modules/.bin/secret-squirrel-commitmsg",
     "prepare": "npx snyk protect || npx snyk protect -d || true"
+  },
+  "engines": {
+    "node": "14.x"
   }
 }