fix: add cargo-binstall as dependency of cargo backend

[jdx]

This just makes it so mise install cargo-binstall first and then uses it
only if it is already defined in config

[codacy-production]

Coverage summary from Codacy

See diff coverage on Codacy

Coverage variation	Diff coverage
✅ +0.09%	✅ 100.00%

Coverage variation details

	Coverable lines	Covered lines	Coverage
Common ancestor commit (46ecc5d)	19503	14947	76.64%
Head commit (b259f70)	19503 (+0)	14965 (+18)	76.73% (+0.09%)

Coverage variation is the difference between the coverage for the head and common ancestor commits of the pull request branch: <coverage of head commit> - <coverage of common ancestor commit>

Diff coverage details

	Coverable lines	Covered lines	Diff coverage
Pull request (#2811)	1	1	100.00%

Diff coverage is the percentage of lines that are covered by tests out of the coverable lines that the pull request added or modified: <covered lines added or modified>/<coverable lines added or modified> * 100%

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[github-actions]

Package	Line Rate	Complexity	Health
src.backend	59%	0	➖
src	81%	0	✔
src.cli	78%	0	✔
src.cli.alias	89%	0	✔
src.cli.args	97%	0	✔
src.cli.backends	95%	0	✔
src.cli.cache	87%	0	✔
src.cli.config	91%	0	✔
src.cli.direnv	80%	0	✔
src.cli.generate	72%	0	➖
src.cli.plugins	84%	0	✔
src.cli.settings	93%	0	✔
src.cli.sync	56%	0	➖
src.cli.tasks	75%	0	✔
src.config.config_file	83%	0	✔
src.config	85%	0	✔
src.plugins	67%	0	➖
src.plugins.core	53%	0	➖
src.shell	98%	0	✔
src.task	93%	0	✔
src.toolset	83%	0	✔
src.ui	69%	0	➖
Summary	77% (14965 / 19503)	0	✔