ESMValTool v2.13.0 release

[jlenh]

Hello hello @ESMValGroup/esmvaltool-developmentteam
Here is a the thread for the the release process of v2.13.0, more updates to come! (Following the steps from here)

Manager	Buddy	Feature Freeze	Feature branch	Milestone
@jlenh	@sloosvel	2025-09-04

Minor Release	Status	Date	RTD	Release	conda-forge	PyPI	Docker
v2.13.0rc1		2025-09-12	Documentation	esmvaltool	conda-forge	--pre esmvaltool	Docker
v2.13.0		2025-10-20	Documentation	esmvaltool	conda-forge	esmvaltool	Docker

[jlenh]

Recipe testing overview here #4157

[jlenh]

@ESMValGroup/userengagementteam The release can now be announced through the usual channels 🙂