Change default map proj to utm (risky) #1692

Job	Run time
prepro on ghcr.io/oggm/untested_base:20231004	3m 34s
prepro on ghcr.io/oggm/untested_base:py3.10	2m 59s
prepro on ghcr.io/oggm/untested_base:py3.9	3m 4s
numerics on ghcr.io/oggm/untested_base:20231004	8m 45s
numerics on ghcr.io/oggm/untested_base:py3.10	6m 21s
numerics on ghcr.io/oggm/untested_base:py3.9	8m 3s
models on ghcr.io/oggm/untested_base:20231004	16m 44s
models on ghcr.io/oggm/untested_base:py3.10	12m 38s
models on ghcr.io/oggm/untested_base:py3.9	15m 33s
benchmark on ghcr.io/oggm/untested_base:20231004	2m 7s
benchmark on ghcr.io/oggm/untested_base:py3.10	1m 36s
benchmark on ghcr.io/oggm/untested_base:py3.9	1m 48s
utils on ghcr.io/oggm/untested_base:20231004	3m 57s
utils on ghcr.io/oggm/untested_base:py3.10	3m 21s
utils on ghcr.io/oggm/untested_base:py3.9	3m 37s
workflow-single on ghcr.io/oggm/untested_base:20231004	7m 11s
workflow-single on ghcr.io/oggm/untested_base:py3.10	5m 17s
workflow-single on ghcr.io/oggm/untested_base:py3.9	6m 40s
workflow-multi on ghcr.io/oggm/untested_base:20231004	7m 28s
workflow-multi on ghcr.io/oggm/untested_base:py3.10	5m 22s
workflow-multi on ghcr.io/oggm/untested_base:py3.9	6m 36s
graphics-mpl on ghcr.io/oggm/untested_base:20231004	2m 44s
graphics-mpl on ghcr.io/oggm/untested_base:py3.10	2m 16s
graphics-mpl on ghcr.io/oggm/untested_base:py3.9	2m 31s
minimal on python:3.11-slim	1m 3s
Coveralls Finished	0s
	2h 21m 15s

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