Update dependency deepmerge to v4

Author: renovate[bot]

package.json

@@ -35,7 +35,7 @@
   "dependencies": {
     "compression": "^1.7.2",
     "dataloader": "^1.4.0",
-    "deepmerge": "^2.0.1",
+    "deepmerge": "^4.0.0",
     "dotenv": "^5.0.0",
     "graphql-depth-limit": "^1.1.0",
     "graphql-iso-date": "^3.5.0",

yarn.lock

@@ -2219,10 +2219,10 @@ deepmerge@^1.5.1, deepmerge@^1.5.2:
   resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-1.5.2.tgz#10499d868844cdad4fee0842df8c7f6f0c95a753"
   integrity sha512-95k0GDqvBjZavkuvzx/YqVLv/6YYa17fz6ILMSf7neqQITCPbnfEnQvEgMPNjH4kgobe7+WIL0yJEHku+H3qtQ==
 
-deepmerge@^2.0.1:
-  version "2.2.1"
-  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-2.2.1.tgz#5d3ff22a01c00f645405a2fbc17d0778a1801170"
-  integrity sha512-R9hc1Xa/NOBi9WRVUWg19rl1UB7Tt4kuPd+thNJgFZoxXsTz7ncaPaeIm+40oSGuP33DfMb4sZt1QIGiJzC4EA==
+deepmerge@^4.0.0:
+  version "4.3.1"
+  resolved "https://registry.yarnpkg.com/deepmerge/-/deepmerge-4.3.1.tgz#44b5f2147cd3b00d4b56137685966f26fd25dd4a"
+  integrity sha512-3sUqbMEc77XqpdNO7FRyRog+eW3ph+GYCbj+rK+uYyRMuwsVy0rMiVtPn+QJlKFvWP/1PYpapqYn0Me2knFn+A==
 
 defaults@^1.0.3:
   version "1.0.3"