Bump version to 5.1.2

release_notes/5.1.2.md

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+# Jasmine Core 5.1.2 Release Notes
+
+## Bug Fixes
+
+* Fixed `throwUnlessAsync`
+  * Fixes [#2026](https://github.com/jasmine/jasmine/issues/2026)
+
+# Documentation improvements 
+
+* Added Safari 17 to supported browsers
+* Added Firefox 115 (current ESR) to supported browsers
+
+## Supported environments
+
+This version has been tested in the following environments.
+
+| Environment       | Supported versions |
+|-------------------|--------------------|
+| Node              | 18, 20             |
+| Safari            | 15-17              |
+| Chrome            | 121                |
+| Firefox           | 102, 115, 122      |
+| Edge              | 121                |
+
+------
+
+_Release Notes generated with _[Anchorman](http://github.com/infews/anchorman)_