chore(dev-deps): bump @salesforce/cli-plugins-testkit

Bumps [@salesforce/cli-plugins-testkit](https://github.com/salesforcecli/cli-plugins-testkit) from 5.3.54 to 5.3.55.
- [Release notes](https://github.com/salesforcecli/cli-plugins-testkit/releases)
- [Changelog](https://github.com/salesforcecli/cli-plugins-testkit/blob/main/CHANGELOG.md)
- [Commits](salesforcecli/cli-plugins-testkit@5.3.54...5.3.55)

---
updated-dependencies:
- dependency-name: "@salesforce/cli-plugins-testkit"
  dependency-version: 5.3.55
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

package.json

@@ -16,7 +16,7 @@
   "devDependencies": {
     "@oclif/core": "^4.10.6",
     "@oclif/plugin-command-snapshot": "^5.3.16",
-    "@salesforce/cli-plugins-testkit": "^5.3.54",
+    "@salesforce/cli-plugins-testkit": "^5.3.55",
     "@salesforce/dev-scripts": "^11.0.4",
     "@salesforce/plugin-command-reference": "^3.1.94",
     "eslint-plugin-sf-plugin": "^1.20.33",

yarn.lock

@@ -1801,12 +1801,12 @@
     istanbul-reports "^3.2.0"
     json-stream-stringify "^3.1.6"
 
-"@salesforce/cli-plugins-testkit@^5.3.54":
-  version "5.3.54"
-  resolved "https://registry.yarnpkg.com/@salesforce/cli-plugins-testkit/-/cli-plugins-testkit-5.3.54.tgz#636bed66cb28f94c3d415277d1796f5407a6313f"
-  integrity sha512-OT4S2Wstg2gqWWbhG4q+/AioIWpU1BEsC+KBIBtw1Wckktxv6B/SWlpgIrCz6nQAPwwDpY1sNeGLxpDsNUKVzw==
+"@salesforce/cli-plugins-testkit@^5.3.55":
+  version "5.3.55"
+  resolved "https://registry.yarnpkg.com/@salesforce/cli-plugins-testkit/-/cli-plugins-testkit-5.3.55.tgz#9230cb131950c60334b250940826ad20fe029023"
+  integrity sha512-NzV5WWHJDoybEtHVeTOQt/P/VizWsYwhiyAMU98NG+xAdQVBYyTx/2NhRTgnatxqHyNkYKwPMIJJQ9FLvHpU1A==
   dependencies:
-    "@salesforce/core" "^8.28.4"
+    "@salesforce/core" "^8.29.0"
     "@salesforce/kit" "^3.2.6"
     "@salesforce/ts-types" "^2.0.11"
     "@types/shelljs" "^0.10.0"