Fix TS issues in `writeGitVersion` #844

Job	Run time
Build and Test on Node 20.x	41s
Check package config with are-the-types-wrong (20.x)	8s
Test Types with TypeScript 4.7	39s
Test Types with TypeScript 4.8	39s
Test Published Artifact cra4	1m 27s
Test Types with TypeScript 4.9	42s
Test Published Artifact cra5	1m 20s
Test Types with TypeScript 5.0	32s
Test Published Artifact next	1m 2s
Test Types with TypeScript 5.1	36s
Test Published Artifact vite	56s
Test Types with TypeScript 5.2	36s
Test Published Artifact node-standard	21s
Test Types with TypeScript 5.3	32s
Test Published Artifact node-esm	20s
Test Types with TypeScript 5.4	31s
Test Published Artifact react-native	1m 12s
Test Published Artifact expo	1m 7s
	13m 21s

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