MINOR: [C#] Bump ZstdSharp.Port from 0.8.1 to 0.8.2 in /csharp

[dependabot[bot]]

Bumps ZstdSharp.Port from 0.8.1 to 0.8.2.

Release notes

Sourced from ZstdSharp.Port's releases.

0.8.2

Added .NET 9 target Added SetPledgedSrcSize to CompressionStream and Compressor Cleanup code and improve reliability by @​teo-tsirpanis in #38

Commits

• a007237 0.8.2
• a9888bc Added .NET 9 target
• 7ceab2b Removed Vector128 polyfill
• 8bcebe1 Update packages
• b18e37b InlineMethod.Fody updated, reduced assembly size by ~20kb
• 2dd232c UnsafeHelper cleanup
• b15b543 The actual default compression level is 3
• 48ee80b Methods rename
• 5cc0c37 Added SetPledgedSrcSize
• ec0b4f8 Comment
• Additional commits viewable in compare view

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[conbench-apache-arrow[bot]]

After merging your PR, Conbench analyzed the 3 benchmarking runs that have been run so far on merge-commit 7cccd5f1686d59189a95973428d14ce6efe59782.

There were no benchmark performance regressions. 🎉

The full Conbench report has more details.