Upscale Herb Label to 300 DPI or higher

I have a finished label for my fresh-herb clamshells, but the label manufacturer kicked it back because the PNG I supplied sits well under their 300 dpi threshold. I don’t need the artwork tweaked—just... (Budget: $30 - $250 USD, Jobs: Adobe Illustrator, Adobe Photoshop, Graphic Design, Illustrator, Logo Design, PDF, Photoshop, Print Design)