log: bump logrotate dep, switch to zstd compressor

[jharveyb]

Change Description

Description of change / link to associated issue.

Similar change to https://github.com/btcsuite/btcd/pull/2238 . Updates the log rotation dependency s.t. we can use ZSTD compression for logs instead of GZIP.

Steps to Test

Steps for reviewers to follow to test the change.

• Run this build outside of itests.
• Generate enough logs to cause log rotation.
• Try to unzip the logs with any zstd CLI tool. The upstream implementation, https://github.com/facebook/zstd , is packaged for many distributions.

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Testing

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