hc: version signature filename (v2) to defeat email/CDN image caching

data/hc_campaigns/hc_revalidation_personal.html

@@ -78,7 +78,7 @@
           <p style="margin:0 0 10px;font-size:14px;color:#1f2937;line-height:1.7;font-style:italic;">&ldquo;If we file your revalidation and you are not completely satisfied, I will personally make it right. You will not pay billable hours, and you will not be left chasing a government portal on your own. That is my promise.&rdquo;</p>
           <p style="margin:0;">
             <a href="https://performancewest.net/about" style="text-decoration:none;">
-              <img src="https://performancewest.net/images/justin-signature.png" alt="Justin Hannah" width="150" style="width:150px;height:auto;display:block;margin:0 0 2px;" />
+              <img src="https://performancewest.net/images/justin-signature-v2.png" alt="Justin Hannah" width="150" style="width:150px;height:auto;display:block;margin:0 0 2px;" />
             </a>
             <span style="font-size:13px;font-weight:700;color:#0f172a;">Justin Hannah</span><br>
             <span style="font-size:12px;color:#64748b;">Founder &amp; Principal Consultant, Performance West Inc.</span>