Bump elliptic from 6.5.2 to 6.5.3

Bumps [elliptic](https://github.com/indutny/elliptic) from 6.5.2 to 6.5.3.
- [Release notes](https://github.com/indutny/elliptic/releases)
- [Commits](https://github.com/indutny/elliptic/compare/v6.5.2...v6.5.3)

Signed-off-by: dependabot[bot] <support@github.com>

package-lock.json

@@ -1,6 +1,6 @@
 {
     "name": "postwoman",
-    "version": "1.9.7",
+    "version": "1.9.9",
     "lockfileVersion": 1,
     "requires": true,
     "dependencies": {
@@ -5267,9 +5267,9 @@
             "dev": true
         },
         "elliptic": {
-            "version": "6.5.2",
+            "version": "6.5.3",
-            "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.2.tgz",
+            "resolved": "https://registry.npmjs.org/elliptic/-/elliptic-6.5.3.tgz",
-            "integrity": "sha512-f4x70okzZbIQl/NSRLkI/+tteV/9WqL98zx+SQ69KbXxmVrmjwsNUPn/gYJJ0sHvEak24cZgHIPegRePAtA/xw==",
+            "integrity": "sha512-IMqzv5wNQf+E6aHeIqATs0tOLeOTwj1QKbRcS3jBbYkl5oLAserA8yJTT7/VyHUYG91PRmPyeQDObKLPpeS4dw==",
             "requires": {
                 "bn.js": "^4.4.0",
                 "brorand": "^1.0.1",