[typetools/checker-framework] b9d9a9: Update cimg/base Docker tag to v2026.06

[renovate[bot]]

Branch: refs/heads/renovate/cimg-base-2026.x
Home: https://github.com/typetools/checker-framework
Commit: b9d9a967bc165a64bd2510816f50142a2d595ca2
https://github.com/typetools/checker-framework/commit/b9d9a967bc165a64bd2510816f50142a2d595ca2
Author: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Date: 2026-06-02 (Tue, 02 Jun 2026)

Changed paths:
M .circleci/config.yml

Log Message:
-----------
Update cimg/base Docker tag to v2026.06



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