Release notes for 15.0.2

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

doc/releasenotes/15_0_2_changelog.md

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+# Changelog of Vitess v15.0.2
+
+### Bug fixes 
+#### Query Serving
+ * Online DDL: fix 'vtctlclient OnlineDDL' template queries [#11889](https://github.com/vitessio/vitess/pull/11889)
+ * Fix CheckMySQL by setting the correct wanted state [#11895](https://github.com/vitessio/vitess/pull/11895)
+ * bugfix: allow predicates without dependencies with derived tables to be handled correctly [#11911](https://github.com/vitessio/vitess/pull/11911)
+ * [release-15.0] Fix sending a ServerLost error when reading a packet fails (#11920) [#11930](https://github.com/vitessio/vitess/pull/11930)
+ * Skip `TestSubqueriesExists` during upgrade-downgrade tests [#11953](https://github.com/vitessio/vitess/pull/11953) 
+#### VReplication
+ * VReplication: Prevent Orphaned VDiff2 Jobs [#11768](https://github.com/vitessio/vitess/pull/11768)
+### CI/Build 
+#### Build/CI
+ * Fix deprecated usage of set-output [#11844](https://github.com/vitessio/vitess/pull/11844)
+ * Use `go1.19.4` in the next release upgrade downgrade E2E tests [#11924](https://github.com/vitessio/vitess/pull/11924) 
+#### TabletManager
+ * Fix closing the body for HTTP requests [#11842](https://github.com/vitessio/vitess/pull/11842)
+### Enhancement 
+#### General
+ * Upgrade to `go1.18.9` [#11897](https://github.com/vitessio/vitess/pull/11897)
+### Release 
+#### General
+ * Release of v15.0.1 [#11847](https://github.com/vitessio/vitess/pull/11847)
+ * Back to dev mode after v15.0.1 [#11848](https://github.com/vitessio/vitess/pull/11848)
+ * updating summary and release notes for v15.0.1 [#11852](https://github.com/vitessio/vitess/pull/11852)
+ * Update the release `15.0.2` summary doc [#11954](https://github.com/vitessio/vitess/pull/11954)
+

doc/releasenotes/15_0_2_release_notes.md

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+# Release of Vitess v15.0.2
+## Major Changes
+
+### Upgrade to `go1.18.9`
+
+Vitess `v15.0.2` now runs on `go1.18.9`.
+The patch release of Go, `go1.18.9`, was one of the main reasons for this release as it includes an important security fixe to `net/http` package, which is use extensively by Vitess.
+Below is a summary of this patch release. You can learn more [here](https://groups.google.com/g/golang-announce/c/L_3rmdT0BMU).
+
+> go1.18.9 (released 2022-12-06) includes security fixes to the net/http and os packages, as well as bug fixes to cgo, the compiler, the runtime, and the crypto/x509 and os/exec packages.
+
+
+------------
+
+The entire changelog for this release can be found [here](https://github.com/vitessio/vitess/blob/main/doc/releasenotes/15_0_2_changelog.md).
+
+The release includes 14 commits (excluding merges)
+
+Thanks to all our contributors: @GuptaManan100, @dbussink, @frouioui, @mattlord, @rsajwani, @shlomi-noach, @vitess-bot[bot]
+