bump to 0.8.13 #5

Job	Run time
python 3.9 (postgresql 17)	3m 55s
postgresql 12 (python 3.13)	4m 55s
python 3.10 (postgresql 17)	3m 42s
postgresql 13 (python 3.13)	4m 58s
python 3.11 (postgresql 17)	3m 56s
postgresql 14 (python 3.13)	4m 57s
python 3.12 (postgresql 17)	4m 42s
postgresql 15 (python 3.13)	4m 45s
python 3.13 (postgresql 17)	4m 48s
postgresql 16 (python 3.13)	4m 51s
e2e tests with sources	2m 20s
build_package	1m 1s
e2e tests after FitTrackee update / test_package	2m 23s
e2e tests with package / test_package	2m 23s
Push Docker image to multiple registries	0s
Publish Python distribution to PyPI	0s
Upload distribution to GitHub Release	0s
	53m 36s

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