Changelog for 8.11.4 version (#4071) (#4075)

(cherry picked from commit 504318c)

# Conflicts:
#	changelog/fragments/1704304944-Upgrade-to-Go-1.21.5.yaml

Co-authored-by: Pierre HILBERT <pierre.hilbert@elastic.co>

Author: mergify[bot]

changelog/8.11.4.asciidoc

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+// begin 8.11.4 relnotes
+
+[[release-notes-8.11.4]]
+==  8.11.4
+
+Review important information about the  8.11.4 release.
+
+[discrete]
+[[security-updates-8.11.4]]
+=== Security updates
+
+
+elastic-agent::
+
+* Upgrade Go Version To 1.20.12. {elastic-agent-pull}https://github.com/elastic/elastic-agent/pull/3885[#https://github.com/elastic/elastic-agent/pull/3885] 
+
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+// end 8.11.4 relnotes

changelog/8.11.4.yaml

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+version: 8.11.4
+entries:
+    - kind: security
+      summary: Upgrade Go version to 1.20.12.
+      description: ""
+      component: elastic-agent
+      pr:
+        - https://github.com/elastic/elastic-agent/pull/3885
+      issue: []
+      timestamp: 1702055473
+      file:
+        name: 1702055473-Upgrade-to-Go-1.20.12.yaml
+        checksum: d66f715a1ce95792a87a3f632825f5e6e50d8057