docs: Add release notes for 2.36.2 (#9954)

Co-authored-by: robot-ci-heartex <robot-ci-heartex@users.noreply.github.com>
Co-authored-by: Sergey Zhuk <sergey.zhuk@humansignal.com>

Author: robot-ci-heartex

docs/source/guide/release_notes/onprem/2.36.2.md

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+## Label Studio Enterprise 2.36.2
+
+<div class="onprem-highlight">Fixed support report OOM/inaccuracies on large activity logs; patched security vulnerabilities</div>
+
+*Sep 21, 2026*
+
+Helm Chart version: [2.0.8](https://github.com/HumanSignal/charts/blob/master/heartex/label-studio/Chart.yaml)
+
+### Security
+
+- Updated bundled anyio, cryptography, networking, and gRPC libraries to their latest patched releases.
+
+### Bug fixes
+
+- Fixed an issue where generating a support report on instances with large activity logs could exhaust worker memory and fail. This also corrected inaccurate session counts and concurrent session totals that could appear
+in generated reports.