deps: bump actions/setup-node from 6 to 7 #857

Job	Run time
VS Code extension build + typecheck	23s
ShellCheck (embedded *.sh)	10s
Lint	55s
Test	1m 13s
Typecheck OpenCode plugin	14s
PSScriptAnalyzer (embedded *.ps1)	21s
DCO	6s
	3m 22s

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