[Snyk] Security upgrade ethers from 5.4.5 to 5.4.7

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `npm` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • external/keepers/package.json
  • external/keepers/package-lock.json

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Breaking Change	Exploit Maturity
	Regular Expression Denial of Service (ReDoS) SNYK-JS-ETHERS-1586048	No	Proof of Concept

Commit messages

Package name: ethers

The new version differs by 13 commits.

• 4166b27 Updated dist files.
• 32a6b2a Fix parseUints with excess zeros and fix ReDoS issue (#2016, #1975, #1976).
• f2a32d0 docs: added provider.FeeData
• 5762a1f updated dist files.
• 8320d53 Temporarily remove the block miner for clique-based networks from CI testing (#1967).
• c41b89a updated dist files.
• b6a061e More readable errors involving Uint8Arrays.
• a662490 Added Deferred Error support to Description objects to extent Interface parse methods (#1894).
• bdb54ac docs: added cookbook entry to compute raw transaction (#1857).
• 32a90b6 docs: added Alchemy tutorial
• 95b87f6 docs: added BigNumber.toBigInt (#1799).
• 017b1fe Fix address coder to prepare non-hexdatastring addresses as hexdatastring (#1906).
• accb852 Removed temporary code for better errors needed until Alchemy added EIP-1559 support (#1893).

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