Bump skyfield from 1.53 to 1.54 in /scripts

[dependabot]

Bumps skyfield from 1.53 to 1.54.

Changelog

Sourced from skyfield's changelog.

v1.54 — 2026 January 18

• Skyfield’s internal table for the ∆T Earth orientation parameter has been updated, so observations extend to this month and predictions to January 2027. Compared to the previous version of Skyfield, this changes the Earth’s rotation angle by up to 0.2 arcseconds in 2025 and 1.1 arcseconds in 2026.

• The :meth:~skyfield.positionlib.Astrometric.apparent() method now accepts an optional deflectors= argument that lets callers control the list of bodies (by default the Sun, Jupiter, and Saturn) for which the deflection of light is computed. Callers can provide an empty list to turn deflection off.

• The two routines :func:~skyfield.almanac.find_risings() and :func:~skyfield.almanac.find_settings() now skip deflection when computing the target’s apparent position, which increases their speed by around 30%. The routines aim for only millisecond precision, while deflection only makes a difference of microseconds.

• You can now subtract a NumPy array of floating point TT days from a Skyfield :class:~skyfield.timelib.Time object of the same length; previously, only a plain int or float was supported as the subtrahend.

Commits

• dc71178 Declare version 1.54, with updated ∆T table
• 84ede63 Compute what difference new IERS tables make
• a692ae9 Stop rebuilding .npz files if arrays don’t change
• 43636c8 CHANGELOG: add new apparent() argument deflectors=
• d185fae Quick script to test for import loops
• 65a887e Docs: describe how to load >1 ephemeris file #145
• 4cf5f5d Docs: change CometEls.txt mention to actual link
• 52fd26c Don’t pre-build vector functions for eph segments
• 04cddb6 Allow segments to be removed from ephemeris object
• 4d73efb Fix broken Stellarium URL in example Python script
• Additional commits viewable in compare view

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