fix(deps): update module github.com/google/trillian to v1.4.2

[renovate-bot]

This PR contains the following updates:

Package	Type	Update	Change
github.com/google/trillian	require	patch	v1.4.1 -> v1.4.2

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Release Notes

google/trillian

v1.4.2

Compare Source

• #​2568: Allow disabling the writes of ephemeral nodes to storage via the
  --tree_ids_with_no_ephemeral_nodes flag to the sequencer.
• #​2748: --cloudspanner_max_burst_sessions deprecated (it hasn't had any
  effect for a while, now it's more explicit)
• #​2768: update go.mod to use 1.17 compatibility from 1.13.

Dependency updates

• Updated golangci-lint to v1.46.1 (developers should update to this version)
• Removed dependency on certificate-transparency-go

Developer updates

• #​2765 copies the required protos from googleapis into third_party in this
  repository. This simplifies the preconditions in order to compile the proto
  definitions, and removes a big dependency on $GOPATH/src which was archaic;
  $GOPATH/src/github.com/googleapis/googleapis is no longer required.

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