[mpaiao]

What and why

During the tests of #51, some of the tests created hundreds to thousands of warnings. The warnings were due to pandas 4 deprecating dayofyear on DatetimeIndex and Timestamp. For now this is just a bunch of warning messages, but they may become errors in the future. This pull request renames the 7 uses in scripts/calibrate_fast/tower.py, scripts/calibrate_fast/data_rules.py and examples/example02_canopy_phenology/run_phenology.py.

Effect on results (tick exactly one; CI checks)

• Bit-for-bit: output is identical to the base commit's in every run listed under
  Verification.
• Round-off
• Answer-changing

User-facing changes (tick all that apply; each needs an "Upgrading" note in the changelog)

• None
• Config keys added, renamed or removed, or a value in the shipped config files changed
• Output variables or output files changed
• Input files (forcing, maps, initial conditions) or their format changed
• Building or running changed: command-line or CMake options, dependencies, the Python API
• State files written by the last release no longer load

Verification

• Base commit (beta): 2bf6216
• Runs compared with the base commit, and the result: no Fortran or model change, so no model run
  compared. Ran examples/example02_canopy_phenology/run_phenology.py on beta and on this branch
  (pandas 4): the printed parameters and scores and the figure are identical, and the 272
  dayofyear warnings on beta are gone.
• Python tests (scripts/prepare_input/flux_tower/tests, scripts/calibrate_fast): 100 passed,
  5 skipped (those need EDMORE_LIB and EDMORE_MAIN), pandas 4, and the deprecation warnings
  are gone (before, about 2,070 of them).
• The long tests (label long; expected for a science change): not applicable
• Other builds (production preset, nvfortran): not applicable
• Conservation warnings in those runs, or "none": not applicable

Credit and AI use

• Collaborators:
• AI assistance (the tool and what it did): Claude Code (Sonnet 5.5) found the uses, renamed them,
  ran the tests and the example, and wrote the changelog entry. I updated the changelog entry with the PR number.
• I answer for this pull request: I can explain every change in it, and the verification above was actually run

Not in this PR

• Nothing deferred.

[xiangtaoxu]

I will merge this after PR 49