chore: release 2.11.0

[release-please[bot]]

:robot: I have created a release *beep* *boop*

2.11.0 (2021-04-30)

Features

• Add support for optional field in HttpJson stubs for Java (#3356) (893447f)

Bug Fixes

• remove unused package option from java_gapic_library [gapic-generator] (#3341) (857e2aa)

• Use a deterministic ordering for rest placeholders (#3333) (267e4dd)

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[release-please[bot]]

:robot: Release is at https://github.com/googleapis/gapic-generator/releases/tag/v2.11.0 :sunflower: