Merge pull request #85 from apache/dependabot/nuget/src/log4net/System.Text.RegularExpressions-4.3.1

⬆️ Bump System.Text.RegularExpressions from 4.3.0 to 4.3.1 in /src/log4net
diff --git a/src/log4net/log4net.csproj b/src/log4net/log4net.csproj
index 6de258f..24ffd91 100644
--- a/src/log4net/log4net.csproj
+++ b/src/log4net/log4net.csproj
@@ -157,7 +157,7 @@
     <PackageReference Include="System.Runtime.InteropServices" Version="4.3.0" />
     <PackageReference Include="System.Runtime.InteropServices.RuntimeInformation" Version="4.3.0" />
     <PackageReference Include="System.Runtime.Serialization.Formatters" Version="4.3.0" />
-    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.0" />
+    <PackageReference Include="System.Text.RegularExpressions" Version="4.3.1" />
     <PackageReference Include="System.Text.Encoding" Version="4.3.0" />
     <PackageReference Include="System.Threading" Version="4.3.0" />
     <PackageReference Include="System.Threading.Thread" Version="4.0.0" />