[typetools/checker-framework] baa471: Update cimg/base Docker tag to v2025.12

[renovate[bot]]

Branch: refs/heads/master
Home: https://github.com/typetools/checker-framework
Commit: baa471fae946d710cf735bd080f93e9ded30161d
https://github.com/typetools/checker-framework/commit/baa471fae946d710cf735bd080f93e9ded30161d
Author: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Date: 2025-12-18 (Thu, 18 Dec 2025)

Changed paths:
M .circleci/config.yml

Log Message:
-----------
Update cimg/base Docker tag to v2025.12



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