Update appcast.xml

Author: sbarex

appcast.xml

@@ -6,7 +6,7 @@
             <title>2.1.8</title>
             <pubDate>sab, 12 feb 2022 12:18:00 +0100</pubDate>
             <sparkle:minimumSystemVersion>10.15</sparkle:minimumSystemVersion>
-            <enclosure type="application/octet-stream" url="https://github.com/sbarex/SourceCodeSyntaxHighlight/releases/download/2.1.8/Syntax.Highlight.zip" sparkle:shortVersionString="2.1.8" sparkle:version="56" sparkle:edSignature="NetfWTVh3qti4AVeBqm0m/g20AKt8WhC0EVKkD/9MOjYvFZqeNH1a+uQ1PigJxXmJF7nPseaTmoPOpWHgULGCw==" length="10618509" />
+            <enclosure type="application/octet-stream" url="https://github.com/sbarex/SourceCodeSyntaxHighlight/releases/download/2.1.8/Syntax.Highlight.zip" sparkle:shortVersionString="2.1.8" sparkle:version="56" sparkle:edSignature="GbsXmlhPBnT6V0dgDwtBZ1kdOUHyqU9FNCiD9sNRRYWBC53Zz6fz8Lj6IFnEUI9hlznOGaV2oXrDBFu9mzBqAA==" length="10618513" />
             <description><![CDATA[
                 <h2>Release 2.1.8 (56)</h2>
                 <p>New features:</p>