A decade after the Garza family started selling almond-flour tortillas out of their CrossFit gym in Laredo, the Siete Foods founders are getting a pretty sweet deal.PepsiCo announced earlier this month that it’s buying the Austin-based brand for $1.2 billion and expects to close the deal by the first half of 2025. But some fans are suspicious about what changes the soda corporation might make to the grain-free and dairy-free products. The Garza family launched the grain-free tortilla business in 2014 after Veronica, one of the five kids, was diagnosed with autoimmune diseases but still wanted to enjoy the staples of her Mexican American heritage.Since then, the brand has grown nationally, selling tortillas, salsas, seasonings, sauces, cookies, and chips in thousands of stores, from H-E-B to…