Bump specmatic from 1.3.5 to 1.3.8

Bumps [specmatic](https://github.com/znsio/specmatic-python-extensions) from 1.3.5 to 1.3.8.
- [Release notes](https://github.com/znsio/specmatic-python-extensions/releases)
- [Commits](znsio/specmatic-python-extensions@1.3.5...1.3.8)

---
updated-dependencies:
- dependency-name: specmatic
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements.txt

@@ -1,5 +1,5 @@
 Flask==3.0.2
 marshmallow==3.21.1
 pytest==8.1.1
-specmatic==1.3.5
+specmatic==1.3.8
 coverage==7.4.4