Ensure all our internal YAMLs have the .yaml extension #240

Job	Run time
Check if changelog was changed	22s
Generate examples	6m 41s
Run lint checks	1m 36s
Package cores repository	6m 34s
Test package distribution	5m 28s
Run tests on python 3.10	8m 19s
Run tests on python 3.11	5m 15s
Run tests on python 3.12	6m 56s
Run tests on python 3.13	7m 23s
Run tests on python 3.9	9m 8s
Test typing	2m 57s
	1h 0m 39s

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