Build

Bump syn from 2.0.108 to 2.0.110 (#925) #1910

Job	Run time
build-and-test (windows-latest)	4m 8s
build-and-test (ubuntu-latest)	1m 46s
check-style	20s
build-and-test (macos-latest)	1m 29s
	7m 43s

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