Fix a few frequently reported crashes

[jchung01]

Requires updating ZenUtils (>1.20.0) for basic mixin functionality. These are a bit more niche interactions so I think it's fine here instead of UniversalTweaks for now.

• Fix mithminite hood downgrading fluxbores because of incorrect mending logic. Context: https://discord.com/channels/895732612537122836/895732613090779189/1285375037892726814
• Fix random DME crashes on entity deaths. Same fix as floppaxd/DeepMobEvolution#36, so if that ever gets merged/published, mixin/deep_mob_evolution.zs can be removed.

[sainagh]

Added files manually as this gethub version is behind, but they have indeed been added