Bump ta-lib from 0.4.20 to 0.4.21

Bumps [ta-lib](https://github.com/mrjbq7/ta-lib) from 0.4.20 to 0.4.21.
- [Release notes](https://github.com/mrjbq7/ta-lib/releases)
- [Changelog](https://github.com/mrjbq7/ta-lib/blob/master/CHANGELOG)
- [Commits](https://github.com/mrjbq7/ta-lib/compare/TA_Lib-0.4.20...TA_Lib-0.4.21)

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

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

requirements.txt

@@ -13,7 +13,7 @@ requests==2.25.1
 urllib3==1.26.6
 wrapt==1.12.1
 jsonschema==3.2.0
-TA-Lib==0.4.20
+TA-Lib==0.4.21
 technical==1.3.0
 tabulate==0.8.9
 pycoingecko==2.2.0