Bump protobuf-net from 3.2.16 to 3.2.26

Bumps [protobuf-net](https://github.com/protobuf-net/protobuf-net) from 3.2.16 to 3.2.26.
- [Changelog](https://github.com/protobuf-net/protobuf-net/blob/main/docs/releasenotes.md)
- [Commits](https://github.com/protobuf-net/protobuf-net/commits)

---
updated-dependencies:
- dependency-name: protobuf-net
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

DepotDownloader/DepotDownloader.csproj

@@ -1,4 +1,4 @@
-<Project Sdk="Microsoft.NET.Sdk">
+<Project Sdk="Microsoft.NET.Sdk">
   <PropertyGroup>
     <OutputType>Exe</OutputType>
     <TargetFramework>net6.0</TargetFramework>
@@ -12,7 +12,7 @@
   </PropertyGroup>
 
   <ItemGroup>
-    <PackageReference Include="protobuf-net" Version="3.2.16" />
+    <PackageReference Include="protobuf-net" Version="3.2.26" />
     <PackageReference Include="QRCoder" Version="1.4.3" />
     <PackageReference Include="SteamKit2" Version="2.5.0-Beta.1" />
   </ItemGroup>