feat(ncu-config): add support for partially encrypted config files #1434

Job	Run time
Lint using ESLint	19s
Test on Node.js / prepare-node-matrix	5s
Test on Node.js / test (22, macos-latest)	31s
Test on Node.js / test (25, macos-latest, experimental)	26s
Test on Node.js / test (25, ubuntu-latest, experimental)	23s
Test on Node.js / test (24, macos-latest)	30s
Test on Node.js / test (24, ubuntu-latest)	21s
Test on Node.js / test (22, ubuntu-latest)	20s
Test on Node.js / test (20, ubuntu-latest)	27s
Test on Node.js / test (20, macos-latest)	21s
	3m 43s

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