shred: use RefCell to eliminate mut from random source handling #731

Job	Run time
L10n/French Integration Test	1m 3s
L10n/Clap Error Localization Test	46s
L10n/Fluent Syntax Check	17s
L10n/Locale Embedding - Multicall Binary	2m 47s
L10n/Multi-call Binary Install Test (ubuntu-latest, feat_os_unix)	4m 24s
L10n/Installation Test (Make & Cargo) (ubuntu-latest, feat_os_unix)	6m 53s
L10n/Locale Support Verification	6m 21s
L10n/Multi-call Binary Install Test (macos-latest, feat_os_macos)	2m 43s
L10n/Installation Test (Make & Cargo) (macos-latest, feat_os_macos)	6m 48s
L10n/Locale Embedding - Cargo Install	1m 0s
L10n/Build and Test (ubuntu-latest, feat_os_unix)	3m 0s
L10n/Embedded Locale Regression Test	1m 37s
L10n/Build and Test (macos-latest, feat_os_macos)	3m 52s
L10n/Build and Test (windows-latest, feat_os_windows)	7m 21s
L10n/Locale Embedding - Ls Utility	1m 11s
L10n/Locale Embedding - Cat Utility	42s
L10n/Locale Embedding Regression Test	2s
	50m 47s

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