Bump currencyconverter from 0.17.20 to 0.17.21

Bumps [currencyconverter](https://github.com/alexprengere/currencyconverter) from 0.17.20 to 0.17.21.
- [Commits](alexprengere/currencyconverter@v0.17.20...v0.17.21)

---
updated-dependencies:
- dependency-name: currencyconverter
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

requirements.txt

@@ -8,7 +8,7 @@ bleach==6.1.0
 bs4==0.0.2
 cachetools==4.2.2
 countryinfo==0.1.2
-currencyconverter==0.17.20
+currencyconverter==0.17.21
 dateparser==1.2.0
 emoji==2.11.1
 emoji-country-flag==1.3.2