build(deps-dev): update boto3-stubs requirement from 1.37.19 to 1.37.20

---
updated-dependencies:
- dependency-name: boto3-stubs
  dependency-type: direct:development
...

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

Author: dependabot[bot]

pyproject.toml

@@ -24,7 +24,7 @@ isort = "^6.0.0"
 taskipy = "^1.12.2"
 mypy = "^1.10.0"
 boto3 = "^1.34.102"
-boto3-stubs = { version = "1.37.19", extras = [
+boto3-stubs = { version = "1.37.20", extras = [
     "apigateway",
     "apigatewaymanagementapi",
     "apigatewayv2",