<strong> is not a supported tag per flathub guidelines (flameshot-org#4160)

Author: borgmanJeremy

data/appdata/org.flameshot.Flameshot.metainfo.xml

@@ -36,7 +36,7 @@ SPDX-License-Identifier: CC0-1.0
       Powerful and simple to use screenshot software with built-in
       editor with advanced features.
     </p>
-    <p><strong>Features:</strong></p>
+    <p>Features:</p>
     <ul>
       <li>Customizable appearance</li>
       <li>Very easy to use</li>