Bump @nestjs/testing from 6.6.7 to 6.8.0

Bumps [@nestjs/testing](https://github.com/nestjs/nest) from 6.6.7 to 6.8.0.
- [Release notes](https://github.com/nestjs/nest/releases)
- [Commits](nestjs/nest@v6.6.7...v6.8.0)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

yarn.lock

@@ -326,9 +326,9 @@
     uuid "3.3.3"
 
 "@nestjs/testing@^6.2.4":
-  version "6.6.7"
-  resolved "https://registry.yarnpkg.com/@nestjs/testing/-/testing-6.6.7.tgz#ee6df8b3cc1857dba037bbf4ac861b2fbc3bc266"
-  integrity sha512-SKP1aTnTKTKbzL7QqiVmQC3EEZH7javf67GZMuFkIJ5hVCEuc6FEdfV9iyCGH6hC/68ArCa8U8jbxt9+CbyPew==
+  version "6.8.0"
+  resolved "https://registry.yarnpkg.com/@nestjs/testing/-/testing-6.8.0.tgz#3c6ab8bbc851bd25d75d948e51d0a2ac5759fa72"
+  integrity sha512-qElK5EkJbnqGXyulEwDn+U+Gi7Pc6u5ufSkOJuzkTyYozjOgu4Mz22zamFSJuCGJW+nul2EMoT+7QR5LdxpH1w==
   dependencies:
     optional "0.1.4"