fix: block tickers task error #4276

[DereC4]

Description

12/22 3:14:56 PM [Error] : [Slimefun] An Exception was caught while ticking the Block Tickers Task for Slimefun vDev - 1157
12/22 3:14:56 PM [Error] java.util.ConcurrentModificationException: null
12/22 3:14:56 PM [Error] at java.util.HashMap$HashIterator.nextNode(HashMap.java:1605) ~[?:?]
12/22 3:14:56 PM [Error] at java.util.HashMap$KeyIterator.next(HashMap.java:1628) ~[?:?]

Being made as we iterate over the value set

Proposed changes

Update tickChunk to iterate over a copy of the set to avoid concurrent modification for protection

Related Issues (if applicable)

#4276

Checklist

• I have fully tested the proposed changes and promise that they will not break everything into chaos.
• I have also tested the proposed changes in combination with various popular addons and can confirm my changes do not break them.
• I have made sure that the proposed changes do not break compatibility across the supported Minecraft versions (1.16.* - 1.20.*).
• I followed the existing code standards and didn't mess up the formatting.
• I did my best to add documentation to any public classes or methods I added.
• I have added Nonnull and Nullable annotations to my methods to indicate their behaviour for null values
• I added sufficient Unit Tests to cover my code.

[github-actions]

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Branch naming convention	Label
feature/**	🎈 Feature
fix/**	✨ Fix
chore/**	🧹 Chores
api/**	🔧 API
performance/**	💡 Performance Optimization
compatibility/**	🤝 Compatibility

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