upgrade to Go 1.21 (#308) #1125

	name: Benchmarks

	on:
	push:
	branches:
	- main
	pull_request:
	branches:
	- main

	jobs:
	benchmarks:
	name: Run benchmarks
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Setup Go
	uses: actions/setup-go@v3
	with:
	go-version: '1.21.x'
	- name: Install dependencies
	run: go get .
	- name: Run internal benchmarks
	run: \|
	go test -benchmem -run=^$ -bench ^.*$ ./...
	- name: Run Arche benchmarks
	run: \|
	cd benchmark
	go test -benchmem -run=^$ -bench ^.*$ ./arche/...

	competition:
	name: Run competition
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	- name: Setup Go
	uses: actions/setup-go@v3
	with:
	go-version: '1.21.x'
	- name: Install dependencies
	run: go get .
	- name: Benchmark vs. Array of Structs
	run: \|
	cd benchmark
	go test -benchmem -run=^$ -bench ^.*$ ./competition/array_of_structs/...
	- name: Benchmark entity relations
	run: \|
	cd benchmark
	go test -benchmem -run=^$ -bench ^.*$ ./competition/relations/...
	- name: Benchmark vs. other ECS impl.
	run: \|
	cd benchmark
	go test -benchmem -run=^$ -bench ^.*$ ./competition/pos_vel/... --count 5
	go test -benchmem -run=^$ -bench ^.*$ ./competition/add_remove/... --count 5

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