Bump Cronos from 0.8.4 to 0.12.0

[dependabot]

Pinned Cronos at 0.12.0.

Release notes

Sourced from Cronos's releases.

0.12.0

Release Notes

• Added – Support schedule jitter with the H character (#​89 by @​epicoxymoron).
• Changed – Use unsigned types instead of signed ones internally (#​82 in collaboration with @​joesdu).
• Project – Replace netcoreapp3.1 platform with net8.0 in tests.

0.11.1

Release Notes

• Fixed – Make CronExpression equality operators accept null without triggering nullable warnings (#​87 by @​Nechepso).

0.11.0

Release Notes

• Breaking – Sign all the assemblies with a strong name.
• Added – Enable nullable reference types feature.
• Project – Change how versioning is implemented in projects.

0.10.0

Release Notes

• Changed – Removed year 2499 limitation and added tests for max value edge cases (PR #​80 by @​DevJasperNL).
• Fixed – Bug finding occurrence with 0 ticks (PR #​77 by @​DevJasperNL).

0.9.0

Release Notes

• Added – net6.0 platform with trimmable support and enabled analyzers.
• Fixed – Don't throw ArgumentNullException from Parse/TryParse with an empty value (#​70).
• Fixed – CronFormatException.Message has duplicated BaseMessage (#​74).
• Project – Upgrade Hangfire.Build to version 0.5.0 for faster builds.

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