build: bump version number to 13.8.0 #2674

Job	Run time
download_test_data	4s
build (ubuntu-latest)	3m 35s
java_matrix	3s
build (macos-latest)	3m 58s
unit_tests (25)	4m 27s
unit_tests (21)	3m 54s
test_decoder	2m 13s
test_clara	3m 53s
test_run-groovy	42s
spotbugs	11m 31s
test_coatjava (ubuntu-latest, eb-eg)	2m 25s
test_coatjava (ubuntu-latest, eb-epc)	2m 32s
test_coatjava (ubuntu-latest, eb-enc)	2m 51s
test_coatjava (ubuntu-latest, eb-ep)	2m 51s
test_coatjava (ubuntu-latest, kpp)	3m 44s
test_coatjava (ubuntu-latest, eb-eftpi)	2m 22s
test_coatjava (macos-latest, eb-ep, ./run-eb-tests.sh -100 electronproton)	3m 37s
release_build	0s
generate_documentation	1m 4s
deploy_web_pages	0s
final	3s
	55m 49s

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