build: bump version number to 13.7.0 (#1098) #2904

Job	Run time
validation / GitHub context	4s
validation / Dependency info	6s
validation / Build coatjava	2m 1s
validation / Configuration files	10s
validation / Event generation (e_n)	1m 8s
validation / Event generation (e_pC)	1m 4s
validation / Event generation (eFT_K)	1m 17s
validation / Event generation (e_gFT)	1m 41s
validation / Event generation (e_g)	1m 57s
validation / Event generation (e_p)	1m 42s
validation / Run (e_p, rgb_fall2019)	4m 25s
validation / Run (e_n, rgb_fall2019)	5m 17s
validation / Run (e_g, rgb_fall2019)	3m 55s
validation / Run (eFT_K, rgb_fall2019)	4m 27s
validation / Run (e_pC, rgb_fall2019)	4m 6s
validation / Run (e_gFT, rgb_fall2019)	4m 35s
validation / Report efficiency	3s
validation / Report multiplicity	6s
	38m 4s

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