Update sparqlEscapeUri regex

[claire-lovisa]

There is no need to escape single quotes in URIs, which can cause errors then in virtuoso when inserting espaces ', but there is the need to escape < and > to avoid injections.

[MikiDi]

For reference: This has recently been adapted in the ruby template as well. Not the escaping of the angle brackets though ...

[erikap]

Thanks for the fix @claire-lovisa 🙏 We're looking for a strategy to sync the behaviour of the escape-helper across all templates. Progress is tracked in mu-semtech/project#2