Python dependency: Update boto3 requirement in /web/regression

Updates the requirements on [boto3](https://github.com/boto/boto3) to permit the latest version.
- [Release notes](https://github.com/boto/boto3/releases)
- [Commits](https://github.com/boto/boto3/compare/1.39.0...1.40.1)

---
updated-dependencies:
- dependency-name: boto3
  dependency-version: 1.40.1
  dependency-type: direct:production
...

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

requirements.txt

@@ -18,7 +18,7 @@ azure-mgmt-rdbms==10.1.0
 azure-mgmt-resource==24.0.0
 azure-mgmt-subscription==3.1.1
 bcrypt==4.3.*
-boto3==1.39.*
+boto3==1.40.*
 cryptography==45.0.*
 Flask-Babel==4.0.*
 Flask-Compress==1.*