Bump version to 5.6.0

release_notes/5.6.0.md

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+# Jasmine Core 5.6.0 Release Notes
+
+## Changes
+
+* Added [toHaveNoOtherSpyInteractions](https://jasmine.github.io/api/5.6/matchers.html#toHaveNoOtherSpyInteractions) matcher
+  * Merges [#2051](https://github.com/jasmine/jasmine/pull/2051) from @Eradev
+  * Fixes [#1991](https://github.com/jasmine/jasmine/issues/1991)
+
+* Added [toBeNullish](https://jasmine.github.io/api/5.6/matchers.html#toBeNullish) matcher
+  * Merges [#2045](https://github.com/jasmine/jasmine/pull/2045) from @MattMcCherry
+
+* Improved error messages when non-promises are passed to built-in async matchers
+  * Merges [#2049](https://github.com/jasmine/jasmine/pull/2049) from @andiz2
+  * Fixes [#2037](https://github.com/jasmine/jasmine/issues/2037)
+
+* Added [toHaveClasses](https://jasmine.github.io/api/5.6/matchers.html#toHaveClasses) matcher
+  * Merges [#2046](https://github.com/jasmine/jasmine/pull/2046) from @aYorky 
+
+## Documentation updates
+
+* Demoted Safari to best-effort support
+  
+  Due to limited availability of Safari versions for contributors and maintainers
+  as well as in CI, Safari will be supported on the same best-effort basis as
+  environments that are past end of life, such as previous Firefox ESR versions. 
+  See [this discussion](https://github.com/jasmine/jasmine/discussions/2050) for
+  more information about why this change was made and what to expect.
+
+
+## Supported environments
+
+This version has been tested in the following environments.
+
+| Environment       | Supported versions      |
+|-------------------|-------------------------|
+| Node              | 18, 20, 22              |
+| Safari            | 15*, 16*, 17*           |
+| Chrome            | 133*                    |
+| Firefox           | 102**, 115**, 128, 135* |
+| Edge              | 132*                    |
+
+\* Evergreen browser. Each version of Jasmine is tested against the latest
+version available at release time.<br>
+\** Supported on a best-effort basis. Support for these versions may be dropped
+if it becomes impractical, and bugs affecting only these versions may not be
+treated as release blockers.
+
+
+------
+
+_Release Notes generated with _[Anchorman](http://github.com/infews/anchorman)_