Fix TS issues in `writeGitVersion` #1027

Job	Run time
Build and Test on Node 20.x	44s
Test Published Artifact cra4	1m 29s
Test Published Artifact cra5	1m 20s
Test Published Artifact next	1m 3s
Test Published Artifact vite	1m 6s
Check package config with are-the-types-wrong (20.x)	9s
Test Types with TypeScript 4.7	39s
Test Published Artifact node-standard	14s
Test Types with TypeScript 4.8	38s
Test Published Artifact node-esm	15s
Test Types with TypeScript 4.9	40s
Test Published Artifact react-native	1m 12s
Test Types with TypeScript 5.0	38s
Test Published Artifact expo	1m 10s
Test Types with TypeScript 5.1	35s
Test Types with TypeScript 5.2	33s
Test Types with TypeScript 5.3	32s
Test Types with TypeScript 5.4	35s
	13m 32s

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