Bump golang.org/x/tools from 0.20.0 to 0.21.0 (#265) #1780

Job	Run time
Build Blade / Build	1m 18s
Build Blade / Verify Build Reproducibility	1m 11s
Benchmark Tests / Run Benchmark Tests	6m 57s
E2E PolyBFT Tests / Run E2E PolyBFT Tests	48m 34s
E2E Legacy Tests / Run E2E Legacy Tests	3m 50s
Fuzz Tests / Run Fuzz Tests	6m 48s
Property PolyBFT Tests / Run Property PolyBFT Tests	10m 32s
Lint / Run Lint	3m 25s
Unit Tests / Run Unit Tests	13m 20s
	1h 35m 55s

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