chore(deps): bump github.com/ethereum/go-ethereum from 1.9.3 to 1.9.4

[dependabot-preview]

Bumps github.com/ethereum/go-ethereum from 1.9.3 to 1.9.4.

Release notes

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

Frozen Pyjak (v1.9.4)

Geth v1.9.4 is a special maintenance release, that besides fixing issues as usual, also locks in the Istanbul hard fork block numbers for the Ropsten, Rinkeby and Görli test networks:

• Ropsten: 6485846, scheduled October 2, 2019 (ref).
• Rinkeby: 5435345, scheduled November 13, 2019 (ref).
• Görli: 1561651, scheduled October 30, 2019 (ref).

Please update your nodes on the above test networks before the deadlines, otherwise you will end up either on a wrong chain (Ropsten), or stuck altogether (Rinkeby and Görli). The --override.istanbul CLI flag can be used to bail out of the fork even last minute if things go sour.

---

Improvements:

• Accumulate state writes post-Byzantium and only push into the trie at block end (#19953).
• Smarter locking in the transaction pool to avoid some contention (#20080, #20081, #20085).

Bugfixes:

• Fix a USB HID discovery regression on Windows (#20092).
• Various stability and balancing fixes for light servers (#20079).
• Fix some RLP decoding issues around nils for discv5 (#20064).
• Expose the GraphQL port (8547) from our docker images (#20033).
• Fix GraphQL UI serving regression caused by gzip encoding (#20046).
• Fix GraphQL address type decoding to reject invalid strings (#20046).
• Fix P2P metric types so they work properly with Influx/Grafana (#20047).

For a full rundown of the changes please consult the Geth 1.9.4 release milestone.

---

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

• 46891c1 params: release Geth v1.9.4 stable
• c0010f0 Merge pull request #20092 from karalabe/vendor-usb-bump
• 9f98628 vendor: pull in USB Windows fixes
• a6a14f6 Merge pull request #20090 from soc1c/s1-testnet-istanbul
• f9eb307 core/forkid, params: fix tests, enable Istanbul on Rinkeby + testers
• 03c7d8f Merge pull request #20091 from karalabe/cht-1.9.4
• 2becb99 params: bump CHTs for the 1.9.4 release
• ad380cd params: activate Istanbul on Ropsten and Görli
• 7b32d2a Merge pull request #20085 from karalabe/txpool-api-fix
• f40ff23 core: fix tx dedup return error count
• Additional commits viewable in compare view

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---

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[linki]

@dependabot merge

[dependabot-preview]

Superseded by #33.