Increase stack sizes for flusher threads from very minimal 128 to 102… #176

Job	Run time
Check formatting	12s
Clippy check (ubuntu-latest)	29s
Clippy check (windows-latest)	1m 21s
Build and test (ubuntu-latest, stable)	4m 11s
Build and test (ubuntu-latest, 1.70.0)	4m 27s
Clippy check (macos-latest)	33s
Build and test (windows-latest, stable)	5m 40s
Build and test (windows-latest, 1.70.0)	5m 53s
Build and test (macos-latest, stable)	5m 45s
Build and test (macos-latest, 1.70.0)	6m 49s
	35m 20s

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