Add release note for Solr8 version upgrade

source/releasenotes/2025-01-06-Solr8-version-upgrade.md

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+---
+title: Upgraded Solr8 version to address recent security vulnerabilities
+published_date: "2025-01-07"
+categories: [security]
+---
+
+We are pleased to announce the release of an upgraded Solr8 version ([8.11.4](https://solr.apache.org/docs/8_11_4/changes/Changes.html#v8.11.4)) that resolves recently reported security vulnerabilities affecting prior Solr8 releases. This update addresses a vulnerability identified in [CVE-2024-45216](https://nvd.nist.gov/vuln/detail/CVE-2024-45216), although this vulnerability did not directly impact the Pantheon platform's security.
+
+### What's new? ###
+* **Security vulnerability fixes:** This release addresses the latest CVE impacting previous versions of Solr8.
+* **Critical security patches:** Key patches have been applied to mitigate potential exploits and enhance overall system security.