Bump Google.Protobuf from 3.6.1 to 3.15.0 in /Lightbox/LightboxTest#8

dependabot[bot] wants to merge 1 commit intomasterSqlBox/LightBox:masterfrom

dependabot/nuget/Lightbox/LightboxTest/Google.Protobuf-3.15.0SqlBox/LightBox:dependabot/nuget/Lightbox/LightboxTest/Google.Protobuf-3.15.0Copy head branch name to clipboard