build: bump version number to 13.6.0 (#1092) #2875

Job	Run time
validation / Dependency info	7s
validation / GitHub context	3s
validation / Configuration files	6s
validation / Build coatjava	2m 16s
validation / Event generation (e_p)	1m 44s
validation / Event generation (eFT_K)	2m 50s
validation / Event generation (e_n)	1m 43s
validation / Event generation (e_g)	1m 11s
validation / Event generation (e_pC)	1m 17s
validation / Event generation (e_gFT)	1m 13s
validation / Run (eFT_K, rgb_fall2019)	6m 16s
validation / Run (e_p, rgb_fall2019)	4m 50s
validation / Run (e_pC, rgb_fall2019)	4m 31s
validation / Run (e_n, rgb_fall2019)	4m 22s
validation / Run (e_g, rgb_fall2019)	4m 18s
validation / Run (e_gFT, rgb_fall2019)	4m 55s
validation / Report efficiency	1s
validation / Report multiplicity	1s
	41m 44s

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