addition of v11.0.4 and v12.0.3 release notes

Signed-off-by: Florent Poinsard <florent.poinsard@outlook.fr>

doc/releasenotes/11_0_4_release_notes.md

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+# Release of Vitess v11.0.4
+## Announcement
+
+This patch is providing an update regarding the Apache Log4j security vulnerability ([CVE-2021-44832](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44832)) (#9464).
+
+## Known Issues
+
+- An issue where the value of the `-force` flag is used instead of `-keep_data` flag's value in v2 vreplication workflows (#9174) is known to be present in this release. A workaround is available in the description of issue #9174.
+
+ ------------
+## Changelog
+
+### Dependabot
+#### Java
+* build(deps): bump log4j-api from 2.16.0 to 2.17.1 in /java #9464
+
+The release includes 6 commits (excluding merges)
+
+Thanks to all our contributors: @dbussink, @frouioui

doc/releasenotes/11_0_4_summary.md

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+## Announcement
+
+This patch is providing an update regarding the Apache Log4j security vulnerability ([CVE-2021-44832](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44832)) (#9464).
+
+## Known Issues
+
+- An issue where the value of the `-force` flag is used instead of `-keep_data` flag's value in v2 vreplication workflows (#9174) is known to be present in this release. A workaround is available in the description of issue #9174.

doc/releasenotes/12_0_3_release_notes.md

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+# Release of Vitess v12.0.3
+## Announcement
+
+This patch is providing an update regarding the Apache Log4j security vulnerability ([CVE-2021-44832](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44832)) (#9465).
+
+ ------------
+## Changelog
+
+### Dependabot
+#### Java
+* build(deps): bump log4j-api from 2.16.0 to 2.17.1 in /java #9465
+
+
+The release includes 4 commits (excluding merges)
+
+Thanks to all our contributors: @dbussink, @frouioui

doc/releasenotes/12_0_3_summary.md

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+## Major Changes
+
+This patch is providing an update regarding the Apache Log4j security vulnerability ([CVE-2021-44832](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-44832)) (#9465).