dependency: use Node 12 type definitions

This has to correspond to the minimum supported Node version
(which is Node 12 at this moment) so TypeScript can spot
errors when incompatible new features are used.

package-lock.json

@@ -1230,6 +1230,12 @@
         "typescript": "^4.0"
       },
       "dependencies": {
+        "@types/node": {
+          "version": "14.11.5",
+          "resolved": "https://registry.npmjs.org/@types/node/-/node-14.11.5.tgz",
+          "integrity": "sha512-jVFzDV6NTbrLMxm4xDSIW/gKnk8rQLF9wAzLWIOg+5nU6ACrIMndeBdXci0FGtqJbP9tQvm6V39eshc96TO2wQ==",
+          "dev": true
+        },
         "typescript": {
           "version": "4.0.3",
           "resolved": "https://registry.npmjs.org/typescript/-/typescript-4.0.3.tgz",
@@ -1998,9 +2004,9 @@
       }
     },
     "@types/node": {
-      "version": "14.11.2",
-      "resolved": "https://registry.npmjs.org/@types/node/-/node-14.11.2.tgz",
-      "integrity": "sha512-jiE3QIxJ8JLNcb1Ps6rDbysDhN4xa8DJJvuC9prr6w+1tIh+QAbYyNF3tyiZNLDBIuBCf4KEcV2UvQm/V60xfA==",
+      "version": "12.12.64",
+      "resolved": "https://registry.npmjs.org/@types/node/-/node-12.12.64.tgz",
+      "integrity": "sha512-UV1/ZJMC+HcP902wWdpC43cAcGu0IQk/I5bXjP2aSuCjsk3cE74mDvFrLKga7oDC170ugOAYBwfT4DSQW3akDA==",
       "dev": true
     },
     "@types/parse-json": {

package.json

@@ -61,7 +61,7 @@
     "@types/jsonwebtoken": "^8.5.0",
     "@types/morgan": "^1.9.1",
     "@types/nedb": "^1.8.11",
-    "@types/node": "^14.11.2",
+    "@types/node": "^12.12.64",
     "@types/passport": "^1.0.4",
     "@types/passport-jwt": "^3.0.3",
     "@types/react": "^16.9.49",