Bump certifi in /requirements in the pip group across 1 directory

Bumps the pip group with 1 update in the /requirements directory: [certifi](https://github.com/certifi/python-certifi).


Updates `certifi` from 2023.11.17 to 2024.7.4
- [Commits](certifi/python-certifi@2023.11.17...2024.07.04)

---
updated-dependencies:
- dependency-name: certifi
  dependency-type: indirect
  dependency-group: pip
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

Diff for: requirements/requirements.txt

@@ -22,7 +22,7 @@ bump2version==1.0.1
     # via -r requirements.in
 cartopy==0.22.0
     # via -r requirements.in
-certifi==2023.11.17
+certifi==2024.7.4
     # via
     #   pyproj
     #   requests