Allow trailing commas in `error_node_position` and in `error_position` macros #920

Job	Run time
Bench	1m 6s
Build documentation	51s
Check formatting	12s
Coverage	3m 3s
Test minimal rust version	4m 24s
Test (stable)	57s
Test (beta)	57s
Test (nightly)	57s
Test (1.65.0)	5m 9s
Test (stable, --features "std")	56s
Test (stable, --no-default-features)	58s
Test (stable, --no-default-features --features "alloc")	59s
Test (nightly, --no-default-features)	53s
Test (nightly, --no-default-features --features "alloc")	56s
	22m 18s

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