[build] Prepare for release of selenium-4.48.0

[selenium-ci]

Release Info

Tag	selenium-4.48.0
Version	4.48.0
Language	all

Updates Applied

Component	Status
Versions	✅ Updated
CDDL spec files	✅ Updated
Changelogs	✅ Updated
Rust Changelogs	✅ Updated
Selenium Manager	✅ Updated
Authors	✅ Updated

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Auto-generated by release-preparation workflow

[titusfortner]

Closing this while I fix the BiDi code generators.

The CDDL repin in this PR (webref 1207decc) is the first BiDi spec revision to use quoted, hyphenated member keys: emulation.MediaFeatures changed from [{name, value}] to a record keyed by the CSS media-feature names (prefers-color-scheme, any-pointer, ...). The previous pin had 256 member keys, none hyphenated, so the generators have always been able to pass a wire key straight through as a language identifier.

That single change accounts for all 8 failures:

• py (6 targets) - generated _bidi/emulation.py has any-hover: ... = field(...), a SyntaxError, so the two _bidi tests that import it fail at collection.
• rb - verify-bidi-generated reports emulation.rb stale, and regenerating emits any-hover: hash labels, which is also invalid.
• js - bidi-schema-tests diverges from the cddl2ts oracle, which camelCases the 21 hyphenated fields.

I'll land the generator fix plus the regenerated Ruby artifacts on trunk, then re-run release preparation for 4.48.0.