Update dill requirement in /sdks/python

Updates the requirements on [dill](https://github.com/uqfoundation/dill) to permit the latest version.
- [Release notes](https://github.com/uqfoundation/dill/releases)
- [Commits](uqfoundation/dill@dill-0.3.1.1...0.4.0)

---
updated-dependencies:
- dependency-name: dill
  dependency-version: 0.4.0
  dependency-type: direct:production
...

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

Author: dependabot[bot]

sdks/python/container/base_image_requirements_manual.txt

@@ -42,4 +42,4 @@ scikit-learn
 build>=1.0,<2 # tool to build sdist from setup.py in stager.
 # Dill 0.3.1.1 is included as a base manual requirement so is avaiable to users
 # with pickle_library=dill, but apache-beam does not have a hard dependency.
-dill>=0.3.1.1,<0.3.2
+dill>=0.3.1.1,<0.4.1