Update library dependencies

Cannot update NHibernate to 4.1.2.4000 because it contains breaking
changes for custom types in Linq queries, which could break Epro.

refs EP-47400

Author: Alex Davidson

Bluewire.NHibernate.Audit.UnitTests/Bluewire.NHibernate.Audit.UnitTests.csproj

@@ -15,7 +15,7 @@
       <Version>3.3.1</Version>
     </PackageReference>
     <PackageReference Include="Bluewire.Common">
-      <Version>9.0.2</Version>
+      <Version>15.0.0</Version>
     </PackageReference>
     <PackageReference Include="Iesi.Collections">
       <Version>4.0.0.4000</Version>

Bluewire.NHibernate.Audit/Bluewire.NHibernate.Audit.csproj

@@ -13,7 +13,7 @@
       <Version>4.0.0.4000</Version>
     </PackageReference>
     <PackageReference Include="log4net">
-      <Version>2.0.12</Version>
+      <Version>2.0.15</Version>
     </PackageReference>
     <PackageReference Include="NHibernate">
       <Version>4.0.4.4000</Version>