chore(deps): bump github.com/ethereum/go-ethereum from 1.9.2 to 1.9.3

[dependabot-preview]

Bumps github.com/ethereum/go-ethereum from 1.9.2 to 1.9.3.

Release notes

Sourced from github.com/ethereum/go-ethereum's releases.

Tasty Tankard (v1.9.3)

Geth v1.9.3 is a regular maintenance release, highlights being finalization of the Istanbul EIPs.

New Features:

• Add eth.fillTransaction to create-but-not-sign a transaction (#19915).
• Support DNS names in enode URLs during admin.addPeer (#18524).
• Enable gzip compression on the HTTP RPC API endpoint (#19997).
• Reduce light client default peer count from 100 to 10 (#19933).
• Align CLI flags and descriptions a bit better (#19956).

Istanbul changes (progress tracker):

• Implement EIP-152: Blake2B F compression function precompile (#19972).
• Implement EIP-2028: Transaction data gas cost reduction (#19931).
• Implement EIP-2200: Net SSTORE optimizations (#19964).
• Add --override.istanbul flag as a failsafe (#20004).
• Enable Istanbul EIPs in the EVM jumptable (#19993).

Fixed Bugs:

• Update README with the latest fork configs for private networks (#19983, #20002).
• Separate light client and light server P2P handlers internally (#19639, #20010).
• Fix an import crash caused by a data loss from a previous crash (#19986).
• Deprecate Ubuntu Cosmic and enable builders for Ubuntu Eoan (#19955).
• Fix an annoying log in geth attach about cache sanitation (#19911).
• Fix admin.exportChain to forbid overwriting existing file (#20019).
• Update Clef's 4byte database to the most recent version (#19957).
• Add more verbose logging to even small chain reorgs (#18950).
• Fix iOS builds broken from a gomobile update (#19995).

For a full rundown of the changes please consult the Geth 1.9.3 release milestone.

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As with all our previous releases, you can find the:

• Pre-built binaries for all platforms on our downloads page.
• Docker images published under ethereum/client-go.
• Ubuntu packages in our Launchpad PPA repository.
• OSX packages in our Homebrew Tap repository.

Commits

• cfbb969 params: release Geth v1.9.3 stable
• 1611815 cmd/utils: reduce light.maxpeers default for clients to 1/10th (#19933)
• b8a9457 Merge pull request #19915 from holiman/filltx
• af16ca1 rpc: raise limit in TestClientNotificationStorm (#19999)
• cedf8be retesteth: enable maxResults in AccountRange (#20020)
• d5bd383 Merge pull request #20019 from holiman/minor_adminfix
• 292cf7c eth: disallow overwrite files via admin.exportChain
• 396f1dd les: fix panic (#20013)
• 6850259 les: wait for all task goroutines before dropping the peer (#20010)
• a978adf README: change chainID to <arbitrary positive integer> (#20002)
• Additional commits viewable in compare view

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