Bump BouncyCastle.Cryptography from 2.2.1 to 2.3.1 in /util

Bumps [BouncyCastle.Cryptography](https://github.com/bcgit/bc-csharp) from 2.2.1 to 2.3.1.
- [Commits](bcgit/bc-csharp@release-2.2.1...release-2.3.1)

---
updated-dependencies:
- dependency-name: BouncyCastle.Cryptography
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

util/UtilPlugin.csproj

@@ -78,8 +78,9 @@
     <Reference Include="BouncyCastle.Crypto, Version=1.9.0.0, Culture=neutral, PublicKeyToken=0e99375e54769942, processorArchitecture=MSIL">
       <HintPath>..\packages\Portable.BouncyCastle.1.9.0\lib\net40\BouncyCastle.Crypto.dll</HintPath>
     </Reference>
-    <Reference Include="BouncyCastle.Cryptography, Version=2.0.0.0, Culture=neutral, PublicKeyToken=072edcf4a5328938, processorArchitecture=MSIL">
-      <HintPath>..\packages\BouncyCastle.Cryptography.2.2.1\lib\net461\BouncyCastle.Cryptography.dll</HintPath>
+    <Reference Include="BouncyCastle.Cryptography, Version=2.0.0.0, Culture=neutral, PublicKeyToken=072edcf4a5328938">
+      <HintPath>..\packages/BouncyCastle.Cryptography.2.3.1/lib/net461/BouncyCastle.Cryptography.dll</HintPath>
+      <Private>True</Private>
     </Reference>
     <Reference Include="CommandSystem.Core, Version=0.0.0.0, Culture=neutral, processorArchitecture=MSIL">
       <HintPath>..\packages\EXILED.8.8.1\lib\net48\CommandSystem.Core.dll</HintPath>

util/packages.config

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <packages>
-  <package id="BouncyCastle.Cryptography" version="2.2.1" targetFramework="net48" />
+  <package id="BouncyCastle.Cryptography" version="2.3.1" targetFramework="net48" />
   <package id="EXILED" version="8.8.1" targetFramework="net48" />
   <package id="Google.Protobuf" version="3.24.3" targetFramework="net48" />
   <package id="K4os.Compression.LZ4" version="1.3.6" targetFramework="net48" />