Update pandas requirement from ~=1.4.2 to ~=1.4.4 in /api

Updates the requirements on [pandas](https://github.com/pandas-dev/pandas) to permit the latest version.
- [Release notes](https://github.com/pandas-dev/pandas/releases)
- [Changelog](https://github.com/pandas-dev/pandas/blob/main/RELEASE.md)
- [Commits](https://github.com/pandas-dev/pandas/compare/v1.4.2...v1.4.4)

---
updated-dependencies:
- dependency-name: pandas
  dependency-type: direct:production
...

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

api/requirements.txt

@@ -14,5 +14,5 @@ marshmallow~=3.15.0
 faker~=13.11.0
 requests~=2.27.1
 investpy~=1.0.8
-pandas~=1.4.2
+pandas~=1.4.4
 currencyconverter~=0.16.12