chore: Switch `egui` back to release `0.29.0` from git #25765

Job	Run time
Paths filter	7s
Check dependencies	1m 18s
Lints with Rust stable	4m 31s
Test Rust ${{ matrix.rust_version }} / ${{ matrix.os }}	0s
Lints with Rust beta	4m 19s
Test Rust stable / ubuntu-24.04	4m 52s
Lints with Rust nightly	4m 17s
Test Rust stable / windows-latest	13m 5s
Test Rust stable / macos-14	3m 9s
Test Rust nightly / ubuntu-24.04	8m 33s
Test Rust beta / ubuntu-24.04	4m 53s
	49m 4s

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