Bump version to 1.31.3

Author: kamilchodola

src/Nethermind/Directory.Build.props

@@ -17,7 +17,7 @@
     <Copyright>Demerzel Solutions Limited</Copyright>
     <Product>Nethermind</Product>
     <SourceRevisionId Condition="'$(Commit)' != ''">$(Commit)</SourceRevisionId>
-    <VersionPrefix>1.31.2</VersionPrefix>
+    <VersionPrefix>1.31.3</VersionPrefix>
     <VersionSuffix></VersionSuffix>
   </PropertyGroup>