pin micromamba default version to 1.* #710

Job	Run time
micromamba-old-version-1	28s
micromamba-old-version-2	27s
no-environment	6s
no-environment-file	17s
bash (ubuntu-latest)	18s
bash (macos-latest)	56s
check-micromamba-on-path	20s
bash (windows-latest)	39s
cmd	36s
comment-in-environment-file	21s
conda-lock	8s
create-args-multiple-spaces-1	16s
create-args-multiple-spaces-2	24s
custom-condarc	19s
environment-file	19s
env-variable	21s
micromamba-shell (ubuntu-latest)	17s
multiple-shell-init	22s
micromamba-shell (macos-latest)	56s
no-download-with-custom-path	16s
output-environment-path-custom-root-prefix	4s
output-environment-path-env-file	20s
output-environment-path-env-name-overwrite	18s
output-no-environment-path	4s
powershell (ubuntu-latest)	25s
use-micromamba-from-path	16s
powershell (macos-latest)	1m 7s
powershell (windows-latest)	42s
correct-condarc	6s
incorrect-condarc	7s
	11m 35s

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