chore: add v3.19.01 release notes

doc/release-notes/v3.19.01.md

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+# :zap: Security
+
+- No security fixes since previous release
+- Oldest release with no known [security issue](https://github.com/ovh/the-bastion/security/advisories) is `v3.14.15` (2023-11-08)
+
+# :bulb: Highlights
+
+This release adds the possibility to allow plain HTTP on the egress side of the bastion HTTPS proxy.
+
+Of course, this feature is disabled by default, and you must allow it explicitely if your business constraints force you to. To this effect, you may specify the [allowed_egress_protocols](https://ovh.github.io/the-bastion/administration/configuration/osh-http-proxy_conf.html#allowed-egress-protocols) option of the ``osh-http-proxy.conf`` file.
+
+A more complete list of changes can be found below, for an exhaustive (and boring) list, please refer to the [commit log](https://github.com/ovh/the-bastion/compare/v3.19.00...v3.19.01).
+
+# :pushpin: Changes
+- feat: httpproxy: optional support for plain http on egress
+- fix: selfPlaySession: warn in syslog properly
+- chore: github actions: replace ubuntu 20.04 by 24.04 (EOL)
+
+# :fast_forward: Upgrading
+
+- [General upgrade instructions](https://ovh.github.io/the-bastion/installation/upgrading.html)
+- [Specific upgrade instructions for v3.19.01](https://ovh.github.io/the-bastion/installation/upgrading.html#v3-19-01-2025-03-04)