fix: correct Greek September spelling (Σεπτεμτου → Σεπτεμβρίου)

The genitive form of September was missing the βρί syllable, rendering
as "Σεπτεμτου" instead of the correct "Σεπτεμβρίου".

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

Author: 2 people

lib/Date/Language/Greek.pm

@@ -43,7 +43,7 @@ our (@DoW, @DoWs, @MoY, @MoYs, @AMPM, @Dsuf, %MoY, %DoW);
 "Ιουνίου",
 "Ιουλίου",
 "Αυγούστου",
-"Σεπτεμτου",
+"Σεπτεμβρίου",
 "Οκτωβρίου",
 "Νοεμβρίου",
 "Δεκεμβρίου",

t/lang-data.t

@@ -26,7 +26,7 @@ my %expected = (
     French               => { A => "mardi",                                                                a => "mar",                                        B => "septembre",                                                                b => "sep" },
     Gedeo                => { A => "Masano",                                                               a => "Mas",                                        B => "Canissa",                                                                  b => "Can" },
     German               => { A => "Dienstag",                                                             a => "Di",                                         B => "September",                                                                b => "Sep" },
-    Greek                => { A => "\x{3a4}\x{3c1}\x{3af}\x{3c4}\x{3b7}",                                a => "\x{3a4}\x{3c1}",                             B => "\x{3a3}\x{3b5}\x{3c0}\x{3c4}\x{3b5}\x{3bc}\x{3c4}\x{3bf}\x{3c5}",       b => "\x{3a3}\x{3b5}\x{3c0}" },
+    Greek                => { A => "\x{3a4}\x{3c1}\x{3af}\x{3c4}\x{3b7}",                                a => "\x{3a4}\x{3c1}",                             B => "\x{3a3}\x{3b5}\x{3c0}\x{3c4}\x{3b5}\x{3bc}\x{3b2}\x{3c1}\x{3af}\x{3bf}\x{3c5}", b => "\x{3a3}\x{3b5}\x{3c0}" },
     Hungarian            => { A => "Kedd",                                                                 a => "Ked",                                        B => "Szeptember",                                                               b => "Sze" },
     Icelandic            => { A => "\x{de}ri\x{f0}judagur",                                               a => "\x{de}ri",                                   B => "September",                                                                b => "Sep" },
     Italian              => { A => "Martedi",                                                              a => "Mar",                                        B => "Settembre",                                                                b => "Set" },