[typetools/checker-framework] b2d2ec: Update cimg/base Docker tag to v2026.10

[renovate[bot]]

Branch: refs/heads/renovate/cimg-base-2026.x
Home: https://github.com/typetools/checker-framework
Commit: b2d2ecd2b673a9d42b1a59e87d892c279b2918b6
https://github.com/typetools/checker-framework/commit/b2d2ecd2b673a9d42b1a59e87d892c279b2918b6
Author: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Date: 2026-10-02 (Fri, 02 Oct 2026)

Changed paths:
M .circleci/config.yml

Log Message:
-----------
Update cimg/base Docker tag to v2026.10



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