[pre-commit.ci] auto fixes from pre-commit.com hooks

for more information, see https://pre-commit.ci

Author: pre-commit-ci[bot]

src/content/sponsors/pretix/index.md

@@ -14,5 +14,4 @@ socials:
   mastodon: "https://pretix.social/@pretix"
   youtube: "https://www.youtube.com/channel/UCG1Og1YUpgIJD4geAZLAp5g"
 tier: Silver
-
 ---