Add v0.51.5 to the list of releases (#50507)

Co-authored-by: Metabase bot <metabase-bot@metabase.com>

docs/releases.md

@@ -19,6 +19,7 @@ To see what's new, check out all the [major release announcements](https://www.m
 
 ## Metabase Enterprise Edition releases
 
+- [v1.51.5](https://github.com/metabase/metabase/releases/tag/v1.51.5)
 - [v1.51.4](https://github.com/metabase/metabase/releases/tag/v1.51.4)
 - [v1.51.3](https://github.com/metabase/metabase/releases/tag/v1.51.3)
 - [v1.51.2](https://github.com/metabase/metabase/releases/tag/v1.51.2)
@@ -217,6 +218,7 @@ To see what's new, check out all the [major release announcements](https://www.m
 
 ## Metabase Open Source Edition releases
 
+- [v0.51.5](https://github.com/metabase/metabase/releases/tag/v0.51.5)
 - [v0.51.4](https://github.com/metabase/metabase/releases/tag/v0.51.4)
 - [v0.51.3](https://github.com/metabase/metabase/releases/tag/v0.51.3)
 - [v0.51.2](https://github.com/metabase/metabase/releases/tag/v0.51.2)