feat: Update package.json to 3.1.0

Commit by [GitHub Actions](https://github.com/MessagePack-CSharp/MessagePack-CSharp/actions/runs/12291948244)

feat: Update package.json to 3.0.301

Commit by [GitHub Actions](https://github.com/MessagePack-CSharp/MessagePack-CSharp/actions/runs/12232722029)

feat: Update package.json to 3.0.300

Commit by [GitHub Actions](https://github.com/MessagePack-CSharp/MessagePack-CSharp/actions/runs/12196242616)

Merge remote-tracking branch 'origin/master'

Merge pull request MessagePack-CSharp#2055 from MessagePack-CSharp/fi…

…xBuggyWrites

Fix bugs in serializing long numbers

Merge pull request MessagePack-CSharp#2036 from MessagePack-CSharp/fi…

…x2034

Avoid crashing with stack overflow on recursive generic type parameter constraints

Merge pull request MessagePack-CSharp#2032 from MessagePack-CSharp/nu…

…llableValueTypes

Use simpler C# syntax for nullable value types

Merge pull request MessagePack-CSharp#2015 from MessagePack-CSharp/se…

…cureHash_v3

Use a collision-resistant hash algorithm for untrusted data

Merge pull request MessagePack-CSharp#2014 from MessagePack-CSharp/se…

…cureHash

Use a collision-resistant hash algorithm for untrusted data

Merge pull request MessagePack-CSharp#2004 from MessagePack-CSharp/bu…

…ildRc

Build 3.0-rc.1