RDFLib / rdflib / 31493885223

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fix: reject Turtle/N3 local names beginning with a dash (#3497)

The PN_LOCAL production allows "-" inside a local name but not as its
first character, yet the notation3 qname scanner started consuming the
local name immediately after ":", so ":-o" parsed as the IRI
"<...>-o" instead of raising a syntax error.

Raise BadSyntax when the character directly following the prefix colon
is "-". Local names that merely contain a dash (":o-1") and blank node
labels are unaffected.

Adds a regression test in test/test_n3.py and drops the now-passing
xfail markers for the W3C turtle-syntax-bad-ln-dash-start and
trig-syntax-bad-ln-dash-start negative-syntax entries.

Closes #3403

Co-authored-by: Nicholas Car <nick@kurrawong.net>

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