security: rotate minisign registry key #61

Job	Run time
Rust Unit Tests (ubuntu-latest, x86_64-unknown-linux-gnu)	27s
Security Audit	3m 3s
Rust Unit Tests (windows-latest, x86_64-pc-windows-msvc)	1m 10s
Build plug (Linux)	4m 47s
Build plug (Windows)	7m 56s
	17m 23s

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