Bump Google.Protobuf from 3.14.0 to 3.15.0 in /mojoPortal.Data.EF

Bumps [Google.Protobuf](https://github.com/protocolbuffers/protobuf) from 3.14.0 to 3.15.0.
- [Release notes](https://github.com/protocolbuffers/protobuf/releases)
- [Changelog](https://github.com/protocolbuffers/protobuf/blob/master/generate_changelog.py)
- [Commits](protocolbuffers/protobuf@v3.14.0...v3.15.0)

---
updated-dependencies:
- dependency-name: Google.Protobuf
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

mojoPortal.Data.EF/packages.config

@@ -3,7 +3,7 @@
   <package id="BouncyCastle" version="1.8.5" targetFramework="net472" />
   <package id="EntityFramework" version="6.4.4" targetFramework="net472" />
   <package id="EntityFramework6.Npgsql" version="6.4.3" targetFramework="net472" />
-  <package id="Google.Protobuf" version="3.14.0" targetFramework="net472" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net472" />
   <package id="K4os.Compression.LZ4" version="1.2.6" targetFramework="net472" />
   <package id="K4os.Compression.LZ4.Streams" version="1.2.6" targetFramework="net472" />
   <package id="K4os.Hash.xxHash" version="1.0.6" targetFramework="net472" />