Bump NUnit from 3.13.2 to 4.2.2 in /lang/csharp #273

	# Licensed to the Apache Software Foundation (ASF) under one or more
	# contributor license agreements. See the NOTICE file distributed with
	# this work for additional information regarding copyright ownership.
	# The ASF licenses this file to You under the Apache License, Version 2.0
	# (the "License"); you may not use this file except in compliance with
	# the License. You may obtain a copy of the License at
	#
	# https://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
	# limitations under the License.

	name: 'Rat'
	on:
	workflow_dispatch:
	push:
	branches: [ master ]
	pull_request:
	branches: [ master ]

	jobs:
	rat:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v2

	- name: Cache Local Maven Repository
	uses: actions/cache@v2
	with:
	path: ~/.m2/repository
	key: ${{ runner.os }}-maven-${{ hashFiles('**/pom.xml') }}
	restore-keys: \|
	${{ runner.os }}-maven-

	- name: Setup Java
	uses: actions/setup-java@v2
	with:
	distribution: 'adopt'
	java-version: '11'

	- name: Run Rat
	run: mvn test -Dmaven.main.skip=true -Dmaven.test.skip=true -DskipTests=true -P rat -pl :avro-toplevel

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