chore(deps): Update pipgrip requirement from ==0.11.* to ==0.12.*

Updates the requirements on [pipgrip](https://github.com/ddelange/pipgrip) to permit the latest version.
- [Release notes](https://github.com/ddelange/pipgrip/releases)
- [Commits](ddelange/pipgrip@0.11.0...0.12.0)

---
updated-dependencies:
- dependency-name: pipgrip
  dependency-version: 0.12.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

requirements-testing.txt

@@ -7,5 +7,5 @@ mypy == 1.*
 black == 25.*
 ruff == 0.15.*
 moto[s3,sts] == 5.*
-pipgrip == 0.11.*
+pipgrip == 0.12.*
 types-pyyaml == 6.*