Changelog for 8.19.6 (#5761)

* Changelog for 8.19.6

* formatting

Author: ebeahan

changelog/8.19.6.asciidoc

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+// begin 8.19.6 relnotes
+
+[[release-notes-8.19.6]]
+==  8.19.6
+
+Review important information about the  8.19.6 release.
+
+[discrete]
+[[enhancements-8.19.6]]
+=== Enhancements
+
+
+**fleet-server**
+
+* Update Go to v1.25.3. https://github.com/elastic/fleet-server/pull/5699[#5699] 
+
+
+// end 8.19.6 relnotes

changelog/8.19.6.yaml

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+version: 8.19.6
+entries:
+    - kind: enhancement
+      summary: Update Go to v1.25.3
+      description: ""
+      component: fleet-server
+      pr:
+        - https://github.com/elastic/fleet-server/pull/5699
+      issue: []
+      impact: ""
+      action: ""
+      timestamp: 1758819869
+      file:
+        name: 1758819869-bump-golang-1.25.1.yaml
+        checksum: 5e177a285a6483dfddfd4e117d0e6f9c5fb368ec