⬆️ Bump anaconda from 2025.12 to 2026.06

[dependabot]

Bumps anaconda from 2025.12 to 2026.06.

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[mmcky]

⛔ Blocked by #924 — labeled do-not-merge.

A full forced re-execution of all lectures under anaconda 2026.06 (pandas 3.0.3) shows that merging this bump breaks hansen_singleton_1982 and hansen_singleton_1983. Both fail at import of pandas_datareader, which is incompatible with pandas 3.0 (TypeError: deprecate_kwarg() missing 1 required positional argument: 'new_arg_name'). They execute cleanly on main (pandas 2.3.3), so this is a genuine regression introduced by the upgrade. Root cause and the suggested fix (drop pandas_datareader; fetch FRED + Fama-French directly) are in #924.

Note: the green preview check on this PR only proves the conda environment solves — it does not re-execute the notebooks, because the build uses execute_notebooks: "cache" and restores the cache from main. The regression only surfaces under a forced full execution (run 27897336159).

Two other lectures (ar1_bayes, ar1_turningpts) also fail in that run, but for an unrelated, pre-existing arviz issue (already red on main's weekly cache build) — not caused by this bump; see the note in #924. (ols additionally hit a transient HTTP 500 on a data download — not a regression.)