Pin dependencies

[renovate]

This PR contains the following updates:

Package	Type	Update	Change
@strictsoftware/typedoc-plugin-monorepo	devDependencies	pin	^0.3.1 -> 0.3.1
@types/bn.js	devDependencies	pin	^4.11.6 -> 4.11.6
@types/jest	devDependencies	pin	^25.2.1 -> 25.2.1
@typescript-eslint/eslint-plugin	devDependencies	pin	^2.29.0 -> 2.29.0
@typescript-eslint/parser	devDependencies	pin	^2.29.0 -> 2.29.0
cross-env	devDependencies	pin	^6.0.3 -> 6.0.3
eslint-plugin-jest	devDependencies	pin	^23.9.0 -> 23.9.0
ethereumjs-util	devDependencies	pin	^6.2.0 -> 6.2.0
ethers	devDependencies	pin	^4.0.47 -> 4.0.47
lerna	devDependencies	pin	^3.20.2 -> 3.20.2
rimraf	devDependencies	pin	^3.0.2 -> 3.0.2
ts-jest (source)	devDependencies	pin	^25.3.1 -> 25.4.0
typedoc (source)	devDependencies	pin	^0.17.0-3 -> 0.17.0-3
typescript (source)	devDependencies	pin	^3.8.3 -> 3.8.3

📌 Important: Renovate will wait until you have merged this Pin PR before creating any upgrade PRs for the affected packages. Add the preset :preserveSemverRanges to your config if you instead don't wish to pin dependencies.

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