build: bump version number to 13.7.0 #2902

Job	Run time
validation / Dependency info	7s
validation / GitHub context	4s
validation / Configuration files	6s
validation / Build coatjava	1m 59s
validation / Event generation (e_g)	1m 54s
validation / Event generation (e_pC)	59s
validation / Event generation (e_p)	1m 15s
validation / Event generation (eFT_K)	1m 6s
validation / Event generation (e_n)	1m 59s
validation / Event generation (e_gFT)	1m 46s
validation / Run (eFT_K, rgb_fall2019)	4m 39s
validation / Run (e_n, rgb_fall2019)	4m 13s
validation / Run (e_g, rgb_fall2019)	4m 11s
validation / Run (e_pC, rgb_fall2019)	4m 47s
validation / Run (e_p, rgb_fall2019)	4m 55s
validation / Run (e_gFT, rgb_fall2019)	4m 38s
validation / Report efficiency	3s
validation / Report multiplicity	8s
	38m 49s

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