fix: test/appium/requirements.txt to reduce vulnerabilities
fix: test/appium/requirements.txt to reduce vulnerabilities

The following vulnerabilities are fixed by pinning transitive dependencies:
- https://snyk.io/vuln/SNYK-PYTHON-URLLIB3-1014645

Signed-off-by: Andrea Maria Piana <39e16ece3c2d27e1889178b15ddb376e524032f8@gmail.com>

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