Update lodash to 4.17.20

This addresses a Prototype pollution as follows:
https://snyk.io/vuln/SNYK-JS-LODASH-608086Signed-off-by: Takuya Noguchi <takninnovationresearch@gmail.com>

changelogs/unreleased/update-lodash-4-17-15-to-4-17-20.yml

+---
+title: Update lodash to 4.17.20
+merge_request: 41036
+author: Takuya Noguchi
+type: security

package.json

@@ -106,7 +106,7 @@
     "jszip": "^3.1.3",
     "jszip-utils": "^0.0.2",
     "katex": "^0.10.0",
-    "lodash": "^4.17.15",
+    "lodash": "^4.17.20",
     "marked": "^0.3.12",
     "mermaid": "^8.5.2",
     "mersenne-twister": "1.1.0",

yarn.lock

@@ -7744,10 +7744,10 @@ lodash.values@^4.3.0:
   resolved "https://registry.yarnpkg.com/lodash.values/-/lodash.values-4.3.0.tgz#a3a6c2b0ebecc5c2cba1c17e6e620fe81b53d347"
   integrity sha1-o6bCsOvsxcLLocF+bmIP6BtT00c=
 
-lodash@^4.0.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@~4.17.10:
-  version "4.17.15"
-  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.15.tgz#b447f6670a0455bbfeedd11392eff330ea097548"
-  integrity sha512-8xOcRHvCjnocdS5cpwXQXVzmmh5e5+saE2QGoeQmbKmRS6J3VQppPOIt0MnmE+4xlZoumy0GPG0D0MVIQbNA1A==
+lodash@^4.0.0, lodash@^4.17.10, lodash@^4.17.11, lodash@^4.17.13, lodash@^4.17.14, lodash@^4.17.15, lodash@^4.17.20, lodash@~4.17.10:
+  version "4.17.20"
+  resolved "https://registry.yarnpkg.com/lodash/-/lodash-4.17.20.tgz#b44a9b6297bcb698f1c51a3545a2b3b368d59c52"
+  integrity sha512-PlhdFcillOINfeV7Ni6oF1TAEayyZBoZ8bcshTHqOYJYlrqzRK5hagpagky5o4HfCzzd1TRkXPMFq6cKk9rGmA==
 
 log-symbols@^2.1.0, log-symbols@^2.2.0:
   version "2.2.0"