Bump certifi from 2021.5.30 to 2022.12.7

Bumps [certifi](https://github.com/certifi/python-certifi) from 2021.5.30 to 2022.12.7.
- [Release notes](https://github.com/certifi/python-certifi/releases)
- [Commits](certifi/python-certifi@2021.05.30...2022.12.07)

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

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

docs_requirements.txt

@@ -5,7 +5,7 @@ git+https://github.com/cedadev/stac-generator.git#egg=stac_generator
 Babel==2.9.1
 boto3==1.18.53
 botocore==1.21.53
-certifi==2021.5.30
+certifi==2022.12.7
 charset-normalizer==2.0.6
 cloudpickle==2.0.0
 dask==2021.10.0

requirements.txt

@@ -6,7 +6,7 @@ Babel==2.9.1
 boto3==1.18.44
 botocore==1.21.44
 cachetools==4.2.4
-certifi==2021.5.30
+certifi==2022.12.7
 chardet==4.0.0
 ceda-directory-tree==1.0.0
 docutils==0.16