Bump docker/build-push-action from 5 to 6 #12

Job	Run time
prepro on ghcr.io/oggm/untested_base:20231004	4m 19s
prepro on ghcr.io/oggm/untested_base:py3.10	3m 48s
prepro on ghcr.io/oggm/untested_base:py3.9	3m 54s
numerics on ghcr.io/oggm/untested_base:20231004	8m 34s
numerics on ghcr.io/oggm/untested_base:py3.10	7m 27s
numerics on ghcr.io/oggm/untested_base:py3.9	7m 59s
models on ghcr.io/oggm/untested_base:20231004	16m 41s
models on ghcr.io/oggm/untested_base:py3.10	14m 31s
models on ghcr.io/oggm/untested_base:py3.9	15m 23s
benchmark on ghcr.io/oggm/untested_base:20231004	1m 59s
benchmark on ghcr.io/oggm/untested_base:py3.10	1m 50s
benchmark on ghcr.io/oggm/untested_base:py3.9	1m 48s
utils on ghcr.io/oggm/untested_base:20231004	5m 14s
utils on ghcr.io/oggm/untested_base:py3.10	4m 26s
utils on ghcr.io/oggm/untested_base:py3.9	5m 1s
workflow-single on ghcr.io/oggm/untested_base:20231004	7m 12s
workflow-single on ghcr.io/oggm/untested_base:py3.10	6m 11s
workflow-single on ghcr.io/oggm/untested_base:py3.9	6m 43s
workflow-multi on ghcr.io/oggm/untested_base:20231004	7m 15s
workflow-multi on ghcr.io/oggm/untested_base:py3.10	6m 4s
workflow-multi on ghcr.io/oggm/untested_base:py3.9	6m 16s
graphics-mpl on ghcr.io/oggm/untested_base:20231004	2m 45s
graphics-mpl on ghcr.io/oggm/untested_base:py3.10	2m 26s
graphics-mpl on ghcr.io/oggm/untested_base:py3.9	2m 29s
minimal on python:3.11-slim	46s
Coveralls Finished	0s
	2h 31m 1s

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