New certificate for Opta product family (#2112)

* uploading declarations of conformity for Opta Ext A0602

* New UL certificate

---------

Co-authored-by: Julián Caro Linares <jcarolinares@gmail.com>

Author: kateryna-lukina

content/hardware/_unlisted/kits/opta-ext-a0602/certifications/Arduino_AFX00007-CERT_UL.pdf

@@ -1,5 +1,4 @@
 ---
 title: Opta Ext A0602
-certifications: [CE, UKCA]
-sku: [AFX00007]
+certifications: [CE, UKCA, UL]
 ---

content/hardware/_unlisted/kits/opta-ext-a0602/product.md

@@ -1,5 +1,5 @@
 ---
 title: Opta Ext D1608E
-certifications: [CE, UKCA, RoHS]
+certifications: [CE, UKCA, RoHS, UL]
 sku: [AFX00005]
 ---

content/hardware/_unlisted/kits/opta-ext-d1608e/certifications/Arduino_AFX00005-CERT_UL.pdf

@@ -1,5 +1,5 @@
 ---
 title: Opta Ext D1608S
-certifications: [CE, UKCA, RoHS]
+certifications: [CE, UKCA, RoHS, UL]
 sku: [AFX00006]
 ---