[Snyk] Fix for 3 vulnerabilities

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `pip` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • requirements.txt

⚠️ Warning

``` requests 2.24.0 has requirement urllib3!=1.25.0,!=1.25.1,<1.26,>=1.21.1, but you have urllib3 1.26.5. ```

Vulnerabilities that will be fixed

By pinning:

Severity	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	529/1000 Why? Has a fix available, CVSS 6.3	Cross-site Scripting (XSS) SNYK-PYTHON-LXML-1088006	lxml: 4.6.2 -> 4.6.5	No	No Known Exploit
	624/1000 Why? Has a fix available, CVSS 8.2	Cross-site Scripting (XSS) SNYK-PYTHON-LXML-2316995	lxml: 4.6.2 -> 4.6.5	No	No Known Exploit
	479/1000 Why? Has a fix available, CVSS 5.3	Regular Expression Denial of Service (ReDoS) SNYK-PYTHON-URLLIB3-1533435	urllib3: 1.25.10 -> 1.26.5	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

Some vulnerabilities couldn't be fully fixed and so Snyk will still find them when the project is tested again. This may be because the vulnerability existed within more than one direct dependency, but not all of the effected dependencies could be upgraded.

Check the changes in this PR to ensure they won't cause issues with your project.

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