chore(deps): update bokken image package-ci/ubuntu-22.04 to v4.78.0

Author: unity-renovate[bot]

.yamato/project.metafile

@@ -38,13 +38,13 @@ test_platforms:
     default:
         - name: ubuntu
           type: Unity::VM
-          image: package-ci/ubuntu-22.04:v4.77.0
+          image: package-ci/ubuntu-22.04:v4.78.0
           flavor: b1.large
           standalone: StandaloneLinux64
     desktop:
         - name: ubuntu
           type: Unity::VM
-          image: package-ci/ubuntu-22.04:v4.77.0
+          image: package-ci/ubuntu-22.04:v4.78.0
           flavor: b1.large
           smaller_flavor: b1.medium
           standalone: StandaloneLinux64