build(deps): Bump python from 3.12-slim to 3.14-slim in /infra

[dependabot]

Bumps python from 3.12-slim to 3.14-slim.

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[ChelseaKR]

Closing for the same reason as #196: this moves the Lambda image to Python 3.14, which nothing in CI tests (the matrix is 3.12/3.13) while the other image and .python-version stay on 3.12. The interpreter should move once, across both Dockerfiles, the CI matrix, the classifiers and .python-version, rather than image by image.

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