feat(ncu-config): add support for partially encrypted config files #1433

Job	Run time
Lint using ESLint	20s
Test on Node.js / prepare-node-matrix	4s
Test on Node.js / test (24, ubuntu-latest)	22s
Test on Node.js / test (22, ubuntu-latest)	26s
Test on Node.js / test (20, macos-latest)	35s
Test on Node.js / test (24, macos-latest)	23s
Test on Node.js / test (22, macos-latest)	20s
Test on Node.js / test (20, ubuntu-latest)	22s
	2m 52s

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