Bump test-unit from 3.7.3 to 3.7.7

Bumps [test-unit](https://github.com/test-unit/test-unit) from 3.7.3 to 3.7.7.
- [Release notes](https://github.com/test-unit/test-unit/releases)
- [Commits](test-unit/test-unit@3.7.3...3.7.7)

---
updated-dependencies:
- dependency-name: test-unit
  dependency-version: 3.7.7
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Gemfile.lock

@@ -114,7 +114,7 @@ GEM
       gli
       hashie
       logger
-    test-unit (3.7.3)
+    test-unit (3.7.7)
       power_assert
     thor (1.4.0)
     unicode-display_width (3.2.0)
@@ -185,7 +185,7 @@ CHECKSUMS
   sawyer (0.9.2) sha256=fa3a72d62a4525517b18857ddb78926aab3424de0129be6772a8e2ba240e7aca
   serverless-tools (0.19.26)
   slack-ruby-client (3.1.0) sha256=8198cefb065e6c48fd5c62fb84846c8ee23364aea62d4750be9430f81647e172
-  test-unit (3.7.3) sha256=242e22c6df990f11fb6abc2507a238f80810a903291f90d8573261554488175e
+  test-unit (3.7.7) sha256=3c89d5ff0690a16bef9946156c4624390402b9d54dfcf4ce9cbd5b06bead1e45
   thor (1.4.0) sha256=8763e822ccb0f1d7bee88cde131b19a65606657b847cc7b7b4b82e772bcd8a3d
   unicode-display_width (3.2.0) sha256=0cdd96b5681a5949cdbc2c55e7b420facae74c4aaf9a9815eee1087cb1853c42
   unicode-emoji (4.2.0) sha256=519e69150f75652e40bf736106cfbc8f0f73aa3fb6a65afe62fefa7f80b0f80f