(core) another bundle of dependabot suggestions

Summary:
Version changes suggested by dependabot for security issues that
may or may not affect us (it is easier to apply the changes than
to figure out if the issues are relevant).

 * understore 1.12.1
 * ini 1.3.7, 1.3.8
 * electron 19.0.9
 * js-yaml 3.13.1, 3.14.1
 * highlight.js 10.7.3
 * file-type 16.5.4

Test Plan: existing tests pass

Reviewers: georgegevoian

Reviewed By: georgegevoian

Differential Revision: https://phab.getgrist.com/D3629

package.json

@@ -114,21 +114,21 @@
     "csv": "4.0.0",
     "diff-match-patch": "1.0.5",
     "double-ended-queue": "2.1.0-0",
-    "electron": "3.0.7",
+    "electron": "19.0.9",
     "exceljs": "4.2.1",
     "express": "4.16.4",
-    "file-type": "14.1.4",
+    "file-type": "16.5.4",
     "fs-extra": "7.0.0",
     "grain-rpc": "0.1.7",
     "grainjs": "1.0.2",
     "handlebars": "4.7.7",
-    "highlight.js": "9.13.1",
+    "highlight.js": "10.7.3",
     "http-proxy-agent": "5.0.0",
     "https-proxy-agent": "5.0.1",
     "i18n-iso-countries": "6.1.0",
     "image-size": "0.6.3",
     "jquery": "3.5.0",
-    "js-yaml": "3.12.0",
+    "js-yaml": "3.14.1",
     "jsesc": "3.0.2",
     "jsonwebtoken": "8.3.0",
     "knockout": "3.5.0",
@@ -153,7 +153,7 @@
     "tmp": "0.0.33",
     "ts-interface-checker": "1.0.2",
     "typeorm": "0.3.9",
-    "underscore": "1.9.1",
+    "underscore": "1.12.1",
     "uuid": "3.3.2",
     "winston": "2.4.5",
     "ws": "6.2.2"