Update currencyconverter requirement from ~=0.16.12 to ~=0.17.1 in /api

Updates the requirements on [currencyconverter](https://github.com/alexprengere/currencyconverter) to permit the latest version.
- [Release notes](https://github.com/alexprengere/currencyconverter/releases)
- [Commits](https://github.com/alexprengere/currencyconverter/compare/v0.16.12...v0.17.1)

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

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

api/requirements.txt

@@ -15,4 +15,4 @@ faker~=13.11.0
 requests~=2.27.1
 investpy~=1.0.8
 pandas~=1.4.2
-currencyconverter~=0.16.12
+currencyconverter~=0.17.1