deps(deps): bump structlog from 24.1.0 to 25.5.0 (#42)

Bumps [structlog](https://github.com/hynek/structlog) from 24.1.0 to 25.5.0.
- [Release notes](https://github.com/hynek/structlog/releases)
- [Changelog](https://github.com/hynek/structlog/blob/main/CHANGELOG.md)
- [Commits](hynek/structlog@24.1.0...25.5.0)

---
updated-dependencies:
- dependency-name: structlog
  dependency-version: 25.5.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

requirements-base.txt

@@ -27,7 +27,7 @@ hiredis>=2.3.0
 
 # Monitoring & Logging
 prometheus-client==0.23.1
-structlog==24.1.0
+structlog==25.5.0
 
 # Security
 cryptography>=39.0.0

requirements.txt

@@ -40,7 +40,7 @@ hiredis>=2.3.0  # C parser for better Redis performance
 
 # Monitoring & Logging
 prometheus-client==0.23.1
-structlog==24.1.0
+structlog==25.5.0
 
 # Distributed Tracing (Issue #9: Monitoring & Observability)
 opentelemetry-api>=1.20.0