docs: use HTTPS link to IKONS website (#40507)

Author: coliff

Diff for: site/data/icons.yml

@@ -18,7 +18,7 @@ more:
   - name: Dripicons
     website: http://demo.amitjakhu.com/dripicons/
   - name: Ikons
-    website: http://ikons.piotrkwiatkowski.co.uk/
+    website: https://ikons.piotrkwiatkowski.co.uk/
   - name: Icons8
     website: https://icons8.com/
   - name: icofont