Bump syn from 2.0.90 to 2.0.93 #1777

Job	Run time
🔘 Static (3.2.2, ubuntu-latest, stable)	1m 17s
📥 Fetch CI data	1s
🧪 Test (2.7, ubuntu-latest, 1.65)	44s
🧪 Test (2.7, ubuntu-latest, stable)	2m 43s
🧪 Test (2.7, macos-latest, stable)	2m 21s
🧪 Test (2.7, windows-2022, stable)	8m 16s
🧪 Test (3.0, ubuntu-latest, 1.65)	23s
🧪 Test (3.0, ubuntu-latest, stable)	2m 38s
🧪 Test (3.0, macos-latest, stable)	1m 53s
🧪 Test (3.0, windows-2022, stable)	8m 24s
🧪 Test (3.1, ubuntu-latest, 1.65)	40s
🧪 Test (3.1, ubuntu-latest, stable)	2m 37s
🧪 Test (3.1, windows-2022, stable)	7m 7s
🧪 Test (3.2, ubuntu-latest, 1.65)	28s
🧪 Test (3.2, ubuntu-latest, stable)	2m 28s
🧪 Test (3.2, macos-latest, stable)	1m 57s
🧪 Test (3.2, windows-2022, stable)	8m 1s
🧪 Test (3.3, ubuntu-latest, 1.65)	23s
🧪 Test (3.3, ubuntu-latest, stable)	2m 28s
🧪 Test (3.3, macos-latest, stable)	2m 13s
🧪 Test (3.3, windows-2022, stable)	6m 55s
🧪 Test (3.4, ubuntu-latest, 1.65)	38s
🧪 Test (3.4, ubuntu-latest, stable)	2m 18s
🧪 Test (3.4, macos-latest, stable)	2m 10s
🧪 Test (truffleruby, ubuntu-latest, stable)	2m 20s
🧪 Test (truffleruby, macos-latest, stable)	1m 45s
🧪 Test (mswin, windows-2022, stable-x86_64-pc-windows-msvc)	6m 33s
	1h 19m 41s

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