Update mvnw and CI on JDK 21 #161

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	name: NBPackage

	on:
	push:
	pull_request:
	# unlocked event is used as super secret restart button
	types: [opened, synchronize, unlocked]

	jobs:
	linux-build:
	name: Build and test on ${{ matrix.os }}, JDK ${{ matrix.java }}
	strategy:
	matrix:
	java: [ '11', '21' ]
	os: [ 'ubuntu-latest', 'windows-latest', 'macos-latest' ]
	runs-on: ${{ matrix.os }}

	steps:
	- uses: actions/checkout@v4
	- name: Set up JDK ${{ matrix.java }}
	uses: actions/setup-java@v4
	with:
	java-version: ${{ matrix.java }}
	distribution: 'temurin'
	cache: maven

	- name: Build with Maven
	run: ./mvnw --batch-mode --no-transfer-progress clean verify

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