Merge PR #5505 from @phantinuss - Update ATT&CK Heatmap Coverage

chore: update ATT&CK heatmap
chore: add updated ATT&CK coverage image
chore: point heatmap link to master

---------

Co-authored-by: phantinuss <79651203+phantinuss@users.noreply.github.com>

.github/workflows/update-heatmap.yml

@@ -2,7 +2,6 @@ name: Generate Updated ATT&CK Heatmap
 on:
   schedule:
     - cron: "0 0 1 * *"
-    
   workflow_dispatch:
 
 
@@ -31,22 +30,22 @@ jobs:
           title: 'Update ATT&CK Heatmap Coverage'
           body: |
             ### Summary of the Pull Request
-  
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             This PR updates sigma_attack_nav_coverage.json to reflect the current rule coverage.
-            To generate a new SVG file, go to the [MITRE ATT&CK Navigator](https://mitre-attack.github.io/attack-navigator/#layerURL=https://raw.githubusercontent.com/SigmaHQ/sigma/"${GITHUB_SHA}"/other/sigma_attack_nav_coverage.json) and export a SVG via "Layer Controls" > "Export" (download icon) > "render layer to SVG".
-  
+            To generate a new SVG file, go to the [MITRE ATT&CK Navigator](https://mitre-attack.github.io/attack-navigator/#layerURL=https://raw.githubusercontent.com/SigmaHQ/sigma/master/other/sigma_attack_nav_coverage.json) and export a SVG via "Layer Controls" > "Export" (download icon) > "render layer to SVG".
+
             ### Changelog
-  
+
             chore: update ATT&CK heatmap
-  
+
             ### Example Log Event
-  
+
             N/A
-  
+
             ### Fixed Issues
-  
+
             N/A
-  
+
             ### SigmaHQ Rule Creation Conventions
-            
+
             - If your PR adds new rules, please consider following and applying these [conventions](https://github.com/SigmaHQ/sigma-specification/blob/main/sigmahq/sigmahq_conventions.md)