Update VersionPrefix to 21.1.8.3

Author: tannergooding

Directory.Build.props

@@ -47,7 +47,7 @@
     <PackageValidationBaselineVersion>17.0.0</PackageValidationBaselineVersion>
     <Product>ClangSharp</Product>
     <RootNamespace>ClangSharp</RootNamespace>
-    <VersionPrefix>21.1.8.2</VersionPrefix>
+    <VersionPrefix>21.1.8.3</VersionPrefix>
     <VersionSuffix Condition="'$(PACKAGE_PUBLISH_MODE)' != 'stable'">rc1</VersionSuffix>
     <VersionSuffix Condition="'$(GITHUB_EVENT_NAME)' == 'pull_request'">pr</VersionSuffix>
   </PropertyGroup>