Remove Azure package caching task.

Just restoring packages appears to be quicker than using the cache.

Author: bgrainger

.ci/build-steps.yml

@@ -1,20 +1,4 @@
 steps:
-- task: CacheBeta@0
-  inputs:
-    key: |
-      $(Agent.OS)
-      $(Build.SourcesDirectory)/src/MySqlConnector/MySqlConnector.csproj
-      $(Build.SourcesDirectory)/src/MySqlConnector.Authentication.Ed25519/MySqlConnector.Authentication.Ed25519.csproj
-      $(Build.SourcesDirectory)/src/MySqlConnector.Logging.log4net/MySqlConnector.Logging.log4net.csproj
-      $(Build.SourcesDirectory)/src/MySqlConnector.Logging.Microsoft.Extensions.Logging/MySqlConnector.Logging.Microsoft.Extensions.Logging.csproj
-      $(Build.SourcesDirectory)/src/MySqlConnector.Logging.NLog/MySqlConnector.Logging.NLog.csproj
-      $(Build.SourcesDirectory)/src/MySqlConnector.Logging.Serilog/MySqlConnector.Logging.Serilog.csproj
-      $(Build.SourcesDirectory)/tests/Conformance.Tests/Conformance.Tests.csproj
-      $(Build.SourcesDirectory)/tests/MySqlConnector.Tests/MySqlConnector.Tests.csproj
-      $(Build.SourcesDirectory)/tests/SideBySide/SideBySide.csproj
-    path: $(NUGET_PACKAGES)
-  displayName: NuGet build cache
-
 - task: CopyFiles@2
   displayName: 'Copy config.json'
   inputs: