Adding in updated WIDA_IN matrices (2023/2024/2025)

[dbetebenner]

Note

Low Risk
Metadata-only release bump with a startup message date tweak; no functional or security-sensitive code paths change in the shown diff.

Overview
Release metadata for SGPmatrices is bumped from 0.1-3.0 to 0.1-5.0, with the package date set to 2026-9-4 in DESCRIPTION and the generated package docs.

The same version and date are mirrored in the README development badge, inst/CITATION, man/SGPmatrices-package.Rd, and the interactive .onAttach startup line in R/zzz.R (via toOrdinalDate). No analysis logic or matrix-loading code changes appear in this diff.

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