update to use handlebars v5 #884

Job	Run time
rustfmt	5s
clippy	1m 36s
docs	1m 55s
runefmt	1m 41s
basics	1s
miri_rune_alloc	4m 12s
miri_rune	6m 3s
msrv	1m 44s
build_feature (capture-io)	1m 12s
no_default_features	55s
build_feature (cli,doc)	1m 22s
no_std_minimal	4m 4s
build_feature (cli,fmt)	1m 27s
wasm	52s
build_feature (cli)	1m 23s
build_feature (workspace)	59s
build_feature (languageserver)	1m 9s
build_feature (byte-code)	48s
test	10m 13s
	41m 41s

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