chore(deps): Update crewai-tools[mcp] requirement

Updates the requirements on [crewai-tools[mcp]](https://github.com/crewAIInc/crewAI) to permit the latest version.
- [Release notes](https://github.com/crewAIInc/crewAI/releases)
- [Commits](crewAIInc/crewAI@1.6.1...1.15.2)

---
updated-dependencies:
- dependency-name: crewai-tools[mcp]
  dependency-version: 1.15.2
  dependency-type: direct:production
...

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

Author: dependabot[bot]

a2a/git_issue_agent/pyproject.toml

@@ -11,7 +11,7 @@ dependencies = [
     # but litellm requires openai==2.24.0
     "crewai[litellm]>=1.6.1",
     "litellm>=1.91.1",          # Indirect, prevents CVE-2026-42271
-    "crewai-tools[mcp]>=1.6.1",
+    "crewai-tools[mcp]>=1.15.2",
     "urllib3>=2.7.0",   # Indirect; prevents CVE-2025-66418
     "python-multipart>=0.0.32", # Indirect; prevents CVE-2026-24486
     "cryptography>=48.0.0,<49", # Indirect; prevents CVE-2026-26007