Upgrade requests requirement

[Ed Clark (clarked-msft)]

• Improved malformed header handling
• More importantly, 2.33.1 is available in the airgap mirror and 2.33.0 is not.

[Copilot]

Pull request overview

This PR updates the requests dependency for the main single-app Python service, primarily to use a version that’s available in the airgap mirror.

Changes:

• Bump requests from 2.33.0 to 2.33.1 in application/single_app/requirements.txt.

[Copilot]

requests is bumped here, but other app requirement files in the repo are still pinned to requests==2.33.0 (e.g., application/external_apps/bulkloader/requirements.txt and application/external_apps/databaseseeder/requirements.txt). If the motivation is airgap mirror availability (2.33.0 missing), those components will still fail to build/install in the same environment. Consider updating those pins as part of this PR or centralizing the requests version via a shared constraints file to keep them in sync.