Remove unused GSON dependency #331

	# Copyright (c) 2020, 2023 Contributors to the Eclipse Foundation
	#
	# Contributors:
	# Thomas Jaeckle - initial API and implementation
	# Yufei Cai - fix head vs base ahead error
	# Matthias Mailänder - check all files and account for year ranges
	#
	# This program and the accompanying materials are made available under the
	# terms of the Eclipse Public License 2.0 which is available at
	# http://www.eclipse.org/legal/epl-2.0
	#
	# SPDX-License-Identifier: EPL-2.0
	name: License Header

	on:
	pull_request:

	permissions:
	contents: read

	jobs:
	check-license-header-year:
	name: Year
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v4
	- uses: masesgroup/retrieve-changed-files@v3
	id: changed-files
	continue-on-error: true
	- name: Print changed files
	run: \|
	echo "Changed:"
	echo "${{ steps.changed-files.outputs.added_modified }}"
	- name: Check year in license header
	shell: bash
	run: \|
	included_file_endings=".*\.(java)"
	current_year=$(date +'%Y')
	missing_counter=0
	for file in ${{ steps.changed-files.outputs.added_modified }}; do
	if [[ $file =~ $included_file_endings ]]; then
	if grep -q "Copyright (c) $current_year" $file; then
	printf "\xE2\x9C\x94 $file\n"
	elif grep -q "Copyright (c) [0-9]\{4\}, $current_year" $file; then
	printf "\xE2\x9C\x94 $file\n"
	else
	printf "\xE2\x9D\x8C $file\n\tCopyright header with '$current_year' is missing from changed file.\n"
	missing_counter=$(expr $missing_counter + 1)
	fi
	fi
	done
	exit $missing_counter

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