build(deps): update reportlab requirement in /lambdas/pdf-generate

Updates the requirements on [reportlab](https://www.reportlab.com/) to permit the latest version.

---
updated-dependencies:
- dependency-name: reportlab
  dependency-version: 5.0.0
  dependency-type: direct:production
...

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

lambdas/pdf-generate/requirements.txt

@@ -1,3 +1,3 @@
-reportlab>=4.5.1,<5.0
+reportlab>=5.0.0,<6.0
 boto3>=1.43.32,<2.0
 httpx>=0.28.1,<1.0