Bump mix.lock and .tool-versions + fix warnings

[coveralls]

Pull Request Test Coverage Report for Build 1d646d37e749ce2da8e7b923dc8a0d02e24ca747-PR-83

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 383 unchanged lines in 26 files lost coverage.
• Overall coverage decreased (-50.3%) to 49.671%

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Files with Coverage Reduction	New Missed Lines	%
lib/spear/acl.ex	1	90.0%
lib/spear/connection/configuration.ex	1	96.97%
lib/spear/filter/checkpoint.ex	1	0%
lib/spear/persistent_subscription/settings.ex	1	96.67%
lib/spear/position.ex	1	0%
lib/spear/scavenge.ex	1	0%
lib/spear/supported_rpc.ex	1	0%
lib/spear/uuid.ex	1	96.15%
lib/spear/filter.ex	3	90.91%
lib/spear/cluster_member.ex	4	0%
<!--	Total:	383		-->

Totals
Change from base Build 5eda4dc6048507cef05907f3abe8033c2752ba27:	-50.3%
Covered Lines:	378
Relevant Lines:	761

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💛 - Coveralls

[dvic]

I was not aware of the required elixir compatibility, I'll submit a new PR for the dependencies bump if you want, for now I'll close this PR 👍