"Veni vidi vici" means "I came, I saw, I conquered."
"Venit vidit vicit" means "He/she/it came, he/she/it saw, he/she/it conquered." It doesn't make any judgement about gender.
If you think that the gender is important, Latin uses a demonstrative-y/pronoun-like particle: "is/ea/id" which correspond to "...
Vēnit, vīdit, vīcit.
whether the subject is masculine, feminine, or neuter. Latin only has grammatical gender agreement between nouns and the adjectives that modify them. Subject-verb agreement in Latin only involves grammatical person (I, you, he/she/it) and number (singular and plural).