Bump Google.Protobuf in /TimeSeries/PublicApis/SdkExamples/PointZilla

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]>

Author: dependabot[bot]

TimeSeries/PublicApis/SdkExamples/PointZilla/packages.config

@@ -7,7 +7,7 @@
   <package id="ExcelDataReader" version="3.6.0" targetFramework="net47" />
   <package id="ExcelDataReader.DataSet" version="3.6.0" targetFramework="net47" />
   <package id="Fody" version="2.0.0" targetFramework="net47" developmentDependency="true" />
-  <package id="Google.Protobuf" version="3.14.0" targetFramework="net472" />
+  <package id="Google.Protobuf" version="3.15.0" targetFramework="net472" />
   <package id="Humanizer.Core" version="2.8.26" targetFramework="net472" />
   <package id="K4os.Compression.LZ4" version="1.1.11" targetFramework="net472" />
   <package id="K4os.Compression.LZ4.Streams" version="1.1.11" targetFramework="net472" />