Bump splink from 4.0.1 to 4.0.3

Bumps [splink](https://github.com/moj-analytical-services/splink) from 4.0.1 to 4.0.3.
- [Release notes](https://github.com/moj-analytical-services/splink/releases)
- [Changelog](https://github.com/moj-analytical-services/splink/blob/master/CHANGELOG.md)
- [Commits](moj-analytical-services/splink@v4.0.1...v4.0.3)

---
updated-dependencies:
- dependency-name: splink
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

pyproject.toml

@@ -7,7 +7,7 @@ authors = ["Pat Sier <patrick.sier@cms.hhs.gov>",
 
 [tool.poetry.dependencies]
 python = "^3.10"
-splink = "^4.0.1"
+splink = "^4.0.3"
 click = "^8.1.7"
 pandas = "^2.2.2"
 pytest = "^8.3.3"