Set final version of ESMValCore for 2.6 (#1666)

* Add final release

* Set to tomorrow

* Update changelog

Author: sloosvel

CITATION.cff

@@ -188,11 +188,11 @@ authors:
     orcid: "https://orcid.org/0000-0002-5317-1247"
 
 cff-version: 1.2.0
-date-released: 2022-07-11
+date-released: 2022-07-15
 doi: "10.5281/zenodo.3387139"
 license: "Apache-2.0"
 message: "If you use this software, please cite it using these metadata."
 repository-code: "https://github.com/ESMValGroup/ESMValCore/"
 title: ESMValCore
-version: "v2.6.0rc4"
+version: "v2.6.0"
 ...

doc/changelog.rst

@@ -104,6 +104,8 @@ Release
 
 -  Increase version number for ESMValCore v2.6.0rc1 (`#1632 <https://github.com/ESMValGroup/ESMValCore/pull/1632>`__) `sloosvel <https://github.com/sloosvel>`__
 -  Update changelog and version for 2.6rc3 (`#1646 <https://github.com/ESMValGroup/ESMValCore/pull/1646>`__) `sloosvel <https://github.com/sloosvel>`__
+-  Add changelog for rc4 (`#1662 <https://github.com/ESMValGroup/ESMValCore/pull/1662>`__) `sloosvel <https://github.com/sloosvel>`__
+
 
 Automatic testing
 ~~~~~~~~~~~~~~~~~