TIKA-4239: update netty #251

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	name: branch_2x jdk11 build

	on:
	push:
	branches: [ branch_2x ]

	jobs:
	build:
	runs-on: ubuntu-latest
	strategy:
	matrix:
	java: [ '11' ]

	steps:
	- uses: actions/checkout@v2
	- name: Set up JDK ${{ matrix.java }}
	uses: actions/setup-java@v1
	with:
	java-version: ${{ matrix.java }}
	- name: Build with Maven
	run: mvn clean test install javadoc:aggregate

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