Update email notification header to new logo

- Fixes #12369
- Relates to logo update #10404

CHANGELOG.txt

@@ -32,6 +32,7 @@ Changelog
  * Fix: Fix content path links in usage view to scroll to the correct element (Sage Abdullah)
  * Fix: Always show the minimap toggle button (Albina Starykova)
  * Fix: Ensure that dropdown button toggles show with a border in high contrast mode (Ishwari8104, LB (Ben) Johnston)
+ * Fix: Update email notification header to the new logo design (rahulsamant37)
  * Docs: Upgrade Sphinx to 7.3 (Matt Westcott)
  * Docs: Document how to customize date/time format settings (Vince Salvino)
  * Docs: Create a new documentation section for deployment and move fly.io deployment from the tutorial to this section (Vince Salvino)

CONTRIBUTORS.md

@@ -836,6 +836,7 @@
 * Shubham Mukati
 * Matthew Scouten
 * Ishwari8104
+* rahulsamant37
 
 ## Translators
 

docs/releases/6.3.md

@@ -50,6 +50,7 @@ This release adds formal support for Django 5.1.
  * Update polldaddy oEmbed provider to use the crowdsignal URL (Matthew Scouten)
  * Remove polleverywhere oEmbed provider as it this application longer supports oEmbed (Matthew Scouten)
  * Ensure that dropdown button toggles show with a border in high contrast mode (Ishwari8104, LB (Ben) Johnston)
+ * Update email notification header to the new logo design (rahulsamant37)
 
 ### Documentation