[TASK] Change indent for .rst in .editorconfig

For the covenience when creating files with code snippets
the indent of .rst is changed to 4 spaces. This works for
all cases also for lists where normally 3 spaces are used.

Resolves: #94669
Releases: master, 10.4, 9.5
Change-Id: If1ed5927a1e5e17e56edf0696eb4c528599b788c
Reviewed-on: https://review.typo3.org/c/Packages/TYPO3.CMS/+/70159


Tested-by: Christian Kuhn <lolli@schwarzbu.ch>
Tested-by: Oliver Bartsch <bo@cedev.de>
Tested-by: core-ci <typo3@b13.com>
Reviewed-by: Christian Kuhn <lolli@schwarzbu.ch>
Reviewed-by: Oliver Bartsch <bo@cedev.de>