Bump crypto from 3.0.5 to 3.0.6

[dependabot[bot]]

Bumps crypto from 3.0.5 to 3.0.6.

Release notes

Sourced from crypto's releases.

package:crypto v3.0.6

• Move to dart-lang/core monorepo.

Commits

• 5a1b799 Changes as per review
• 8fcbb73 Merge branch 'main' into merge-crypto-package
• 0240a52 Merge pull request #137 from dart-lang/merge-fixnum-package
• 7dff384 Revert changes to package args
• 80b3466 Changes as per review
• ade36c4 Fix the repository URL in pubspec.yaml (#140)
• 61de93e Moving fixes
• 2c91ddb Merge package:fixnum into the core monorepo
• 2d5587c Moving fixes
• 6f54342 Merge package:crypto
• Additional commits viewable in compare view

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[dependabot[bot]]

Looks like crypto is up-to-date now, so this is no longer needed.