Add 'Keith Cirkel' and 'Lindsey Wild' to contributor.json

Reviewed by Tim Nguyen.

This PR adds myself and 'Lindsey' to contributor.json to allow notifications and 'rebuild'
functionality for future and on-going work.

* metadata/contributors.json:

Canonical link: https://commits.webkit.org/269056@main

metadata/contributors.json

@@ -4502,6 +4502,16 @@
          "keishi"
       ]
    },
+   {
+      "emails" : [
+         "webkit@keithcirkel.co.uk"
+      ],
+      "github" : "keithamus",
+      "name" : "Keith Cirkel",
+      "nicks" : [
+         "keithamus"
+      ]
+   },
    {
       "emails" : [
          "keith_miller@apple.com"
@@ -4967,6 +4977,16 @@
       ],
       "name" : "Lia Chen"
    },
+   {
+      "emails" : [
+         "lindseywild@github.com"
+      ],
+      "github" : "lindseywild",
+      "name" : "Lindsey Wild",
+      "nicks" : [
+         "lindseywild"
+      ]
+   },
    {
       "emails" : [
          "lingho@apple.com",