[main] docs: update changelog for v1.0.45 pipeline tools

🚀 Breaking Changes:
- None

📝 Details:
- Added 5 new pipeline management tools
- Pipeline status monitoring and analysis support

CHANGELOG.md

@@ -1,3 +1,20 @@
+## [1.0.45] - 2025-05-24
+
+### Added
+
+- 🔄 **Pipeline Management Tools**: Added GitLab pipeline status monitoring and management functionality
+  - `list_pipelines`: List project pipelines with various filtering options
+  - `get_pipeline`: Get detailed information about a specific pipeline
+  - `list_pipeline_jobs`: List all jobs in a specific pipeline
+  - `get_pipeline_job`: Get detailed information about a specific pipeline job
+  - `get_pipeline_job_output`: Get execution logs/output from pipeline jobs
+- 📊 Pipeline status summary and analysis support
+  - Example: "How many of the last N pipelines are successful?"
+  - Example: "Can you make a summary of the output in the last pipeline?"
+- See: [PR #52](https://github.com/zereight/gitlab-mcp/pull/52)
+
+---
+
 ## [1.0.42] - 2025-05-22
 
 ### Added