[typetools/checker-framework] 2770c5: Update cimg/base Docker tag to v2026.03

[renovate[bot]]

Branch: refs/heads/master
Home: https://github.com/typetools/checker-framework
Commit: 2770c5239b907f27b2609d13ed4d80535bf42893
https://github.com/typetools/checker-framework/commit/2770c5239b907f27b2609d13ed4d80535bf42893
Author: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Date: 2026-03-01 (Sun, 01 Mar 2026)

Changed paths:
M .circleci/config.yml

Log Message:
-----------
Update cimg/base Docker tag to v2026.03



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