Bump certifi in /alpaca/statistically-significant

Bumps [certifi](https://github.com/certifi/python-certifi) from 2020.6.20 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2020.06.20...2022.12.07)

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

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

Author: dependabot[bot]

alpaca/statistically-significant/requirements.txt

@@ -4,7 +4,7 @@ alpha-vantage==2.2.0
 async-timeout==3.0.1
 attrs==20.1.0
 backtrader==1.9.76.123
-certifi==2020.6.20
+certifi==2022.12.7
 chardet==3.0.4
 cycler==0.10.0
 fredapi==0.4.2