CI: Increase doxygen dot maximum #1608

Job	Run time
build-deps (gnu, V110, 4.9.2, 4.4.0)	34s
build-deps (clang, V110, 4.9.2, 4.4.0)	32s
build-deps (mpi, V110, 4.9.2, 4.4.0)	33s
Debug serial build	5m 50s
Debug parallel build	7m 38s
Threadsafe ON, No Fortran	4m 15s
Threadsafe ON, Parallel, No Fortran	5m 9s
Sanitize address, no fortran	5m 57s
Sanitize undefined	6m 36s
Sanitize integer	5m 11s
GTest Enabled	6m 32s
No applications, legacy, or fortran	4m 49s
CATALYST2, parallel	9m 8s
KOKKOS, parallel	8m 6s
No deprecated exodus functions	8m 15s
Use modern CMake configure of netCDF and HDF5 packages with GTest	7m 45s
ADIOS2 enabled	11m 37s
FAODEL and METIS enabled	12m 52s
	1h 51m 19s

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