Merge pull request #2453 from planetarium/8world-skill-data-change · planetarium/lib9c@a7a8fb5

Node.js 16 actions are deprecated. Please update the following actions to use Node.js 20: actions/checkout@v3, actions/setup-dotnet@v3. For more information see: https://github.blog/changelog/2023-09-22-github-actions-transitioning-from-node-16-to-node-20/.

build: Lib9c.Policy/NCStagePolicy.cs#L40

Possible null reference return.

build: Lib9c.Policy/Policy/DebugPolicy.cs#L21

Possible null reference return.

build: Lib9c.Policy/Policy/DebugPolicy.cs#L27

Possible null reference return.

build: Lib9c.Policy/Policy/MinBlockProtocolVersionPolicy.cs#L25

Cannot convert null literal to non-nullable reference type.

build: Lib9c.Policy/Policy/MinBlockProtocolVersionPolicy.cs#L33

Cannot convert null literal to non-nullable reference type.

build: Lib9c.Policy/Policy/SpannedSubPolicy.cs#L45

Cannot convert null literal to non-nullable reference type.