fix: Add user-agent to newm-admin requests #23

Job	Run time
Build (macos-latest, macos, aarch64-apple-darwin, nightly)	9m 6s
Build (windows-latest, windows, x86_64-pc-windows-msvc, nightly)	13m 37s
Build (ubuntu-24.04, ubuntu24, x86_64-unknown-linux-gnu, nightly)	10m 14s
Package Linux AppImage	7m 8s
Package macOS DMG	7m 31s
Package Windows MSI	12m 33s
Create Release	11s
	1h 0m 20s

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