fix(report): conversion into `Box<dyn Diagnostic>` (#370) #905

Job	Run time
Check Wasm build	11s
Check fmt & build docs	37s
Minimal versions check (ubuntu-latest)	21s
Miri	3m 31s
Minimal versions check (macOS-latest)	25s
Build & Test (fancy, 1.70.0, ubuntu-latest)	54s
Minimal versions check (windows-latest)	50s
Build & Test (fancy, 1.70.0, macOS-latest)	47s
Build & Test (fancy, 1.70.0, windows-latest)	1m 42s
Build & Test (fancy, stable, ubuntu-latest)	56s
Build & Test (fancy, stable, macOS-latest)	37s
Build & Test (fancy, stable, windows-latest)	2m 44s
Build & Test (syntect-highlighter, stable, ubuntu-latest)	53s
Build & Test (syntect-highlighter, stable, macOS-latest)	44s
Build & Test (syntect-highlighter, stable, windows-latest)	2m 52s
	18m 4s

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