[Snyk] Security upgrade gitpython from 3.1.27 to 3.1.30 (#5539)

<h3>Snyk has created this PR to fix one or more vulnerable packages in
the `pip` dependencies of this project.</h3>



#### Changes included in this PR

- Changes to the following files to upgrade the vulnerable dependencies
to a fixed version:
    - cvat/requirements/base.txt


<details>
<summary>⚠️ <b>Warning</b></summary>

```
Jinja2 3.1.2 requires MarkupSafe, which is not installed.
h5py 3.6.0 requires numpy, which is not installed.
azure-storage-blob 12.13.0 requires cryptography, which is not installed.

```
</details>


#### Vulnerabilities that will be fixed





##### By pinning:
Severity | Priority Score (*) | Issue | Upgrade | Breaking Change |
Exploit Maturity

:-------------------------:|-------------------------|:-------------------------|:-------------------------|:-------------------------|:-------------------------
![high
severity](https://res.cloudinary.com/snyk/image/upload/w_20,h_20/v1561977819/icon/h.png
"high severity") | **619/1000** <br/> **Why?** Has a fix available, CVSS
8.1 | Remote Code Execution (RCE)
<br/>[SNYK-PYTHON-GITPYTHON-3113858](https://snyk.io/vuln/SNYK-PYTHON-GITPYTHON-3113858)
| `gitpython:` <br> `3.1.27 -> 3.1.30` <br> | 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 affected dependencies could be upgraded.


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



------------



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[//]: #
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---

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cvat/requirements/base.txt

@@ -22,7 +22,7 @@ django-sendfile2==0.7.0
 dj-pagination==2.5.0
 python-logstash-async==2.5.0
 rules==2.2
-GitPython==3.1.27
+GitPython==3.1.30
 coreapi==2.3.3
 django-filter==2.4.0
 Markdown==3.2.2