Add detection of ivoice and variants.

Co-authored-by: Dimitri Papadopoulos Orfanos <3234522+DimitriPapadopoulos@users.noreply.github.com>

Author: mdeweerd

codespell_lib/data/dictionary.txt

@@ -35855,6 +35855,12 @@ iverse->diverse, inverse,
 iversed->inverse, inversed,
 ivocation->invocation
 ivocations->invocations
+ivoice->invoice
+ivoiced->invoiced
+ivoicer->invoicer
+ivoicers->invoicers
+ivoices->invoices
+ivoicing->invoicing
 ivoke->invoke
 ivoked->invoked
 ivoker->invoker