chore: decrease release concurrency #299

Job	Run time
js-test-and-release / check	2m 7s
js-test-and-release / test-electron-renderer	25s
js-test-and-release / test-chrome	58s
js-test-and-release / test-chrome-webworker	52s
js-test-and-release / test-electron-main	46s
js-test-and-release / test-firefox-webworker	1m 11s
js-test-and-release / test-firefox	1m 3s
js-test-and-release / test-node (windows-latest, lts/*)	4m 25s
js-test-and-release / test-webkit (ubuntu-latest, lts/*)	49s
js-test-and-release / test-node (ubuntu-latest, lts/*)	42s
js-test-and-release / test-webkit (macos-latest, lts/*)	1m 50s
js-test-and-release / test-node (macos-latest, lts/*)	1m 48s
js-test-and-release / test-webkit-webworker (ubuntu-latest, lts/*)	1m 4s
js-test-and-release / test-webkit-webworker (macos-latest, lts/*)	2m 7s
js-test-and-release / release-check	7s
js-test-and-release / release	2m 35s
	22m 49s

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