chore(deps): bump ta-lib from 0.6.7 to 0.6.8

Bumps [ta-lib](https://github.com/ta-lib/ta-lib-python) from 0.6.7 to 0.6.8.
- [Release notes](https://github.com/ta-lib/ta-lib-python/releases)
- [Changelog](https://github.com/TA-Lib/ta-lib-python/blob/master/CHANGELOG)
- [Commits](https://github.com/ta-lib/ta-lib-python/compare/v0.6.7...v0.6.8)

---
updated-dependencies:
- dependency-name: ta-lib
  dependency-version: 0.6.8
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

requirements.txt

@@ -4,7 +4,7 @@ bottleneck==1.6.0
 numexpr==2.14.1
 # Indicator libraries
 ft-pandas-ta==0.3.16
-ta-lib==0.6.7
+ta-lib==0.6.8
 technical==1.5.3
 
 ccxt==4.5.11