Backend.Tests: fix typo sofis...->sophisticated #2914

Job	Run time
macOS--dotnet6-only	6m 7s
macOS--dotnet6-and-mono	4m 44s
macOS--mono-only	5m 21s
windows--dotnet6-and-legacyFramework	5m 26s
linux22-github--dotnet-and-mono	3m 30s
linux22-github--dotnet-and-newmono	3m 47s
linux22-vanilla--stockdotnet6-and-newmono	5m 36s
linux22-vanilla--stockdotnet6-and-stockmono	4m 48s
linux22-vanilla--stockdotnet6-only	4m 43s
linux22-vanilla--stockmono-only	5m 4s
windows--dotnet6-only	6m 53s
windows--legacyFramework-only	8m 43s
linux20-github--dotnet-and-mono	3m 26s
linux20-github--dotnet-and-newmono	3m 59s
linux20-vanilla--stockmono-only	5m 10s
linux22-vanilla--newmono-only	6m 26s
linux20-vanilla--newmono-only	5m 34s
conventions	59s
snap_pkg	4m 5s
	1h 34m 21s

Provide feedback