sponsors: Prevent excessive shrinking of sponsor tier titles

Tier names that can be wrapped, will be wrapped unless we prevent the
flex child from shrinking excessively. This will help with adding a new
tier in the next commit.

Author: gmta

src/components/landing/sponsors.astro

@@ -189,7 +189,7 @@ const sponsors = [
           <div class="mb-[64px] relative">
             <div class="flex items-center mb-6">
               <span class="block w-full h-[1px] bg-[#d3d2d6]" />
-              <span class="text-2xl font-semibold px-5">{tier.name}</span>
+              <span class="text-2xl shrink-0 font-semibold px-5">{tier.name}</span>
               <span class="block w-full h-[1px] bg-[#d3d2d6]" />
             </div>
             <div class="flex flex-wrap items-center justify-center gap-4">