hot fix v20.0.2, increased preflight instruction fee padding to 3 million #3079

Job	Run time
Build (ubuntu-latest, x86_64-unknown-linux-gnu, amd64)	2m 41s
Unit tests (ubuntu-20.04, 1.21)	5m 6s
Build (ubuntu-latest, aarch64-unknown-linux-gnu, arm64)	3m 10s
Integration tests (ubuntu-20.04, 1.21, .CLI.)	14m 45s
Integration tests (ubuntu-20.04, 1.21, ^Test(([^C])\|(C[^L])\|(CL[^I])).*$)	12m 36s
Build (macos-latest, x86_64-apple-darwin, amd64)	4m 13s
Build (macos-latest, aarch64-apple-darwin, arm64)	5m 24s
Build (windows-latest, x86_64-pc-windows-gnu, amd64)	5m 46s
	53m 41s

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