feat: upgrade node and salesforce/core to v4 (#560)

Salesforce core has released a major version, so updated to keep in sync. Node also required
updating.

BREAKING CHANGE: Node v16.13 is now required.

Author: randi274

.nvmrc

@@ -1 +1 @@
-v14.17.0
+v16.13

package.json

@@ -13,7 +13,7 @@
     "/messages"
   ],
   "dependencies": {
-    "@salesforce/core": "^3.24.0",
+    "@salesforce/core": "^4.0.1",
     "@salesforce/kit": "^1.7.1",
     "got": "^11.8.2",
     "mime-types": "^2.1.27",
@@ -66,7 +66,7 @@
     "yeoman-assert": "^3.1.1"
   },
   "engines": {
-    "node": ">=14.17.0"
+    "node": ">=16.13.0"
   },
   "resolutions": {
     "yeoman-generator": "^5.6.1",
@@ -88,4 +88,4 @@
       "path": "./node_modules/cz-conventional-changelog"
     }
   }
-}
+}