Fix TS issues in `writeGitVersion` #1019

Job	Run time
Build and Test on Node 20.x	36s
Check package config with are-the-types-wrong (20.x)	9s
Test Published Artifact cra4	1m 28s
Test Types with TypeScript 4.7	38s
Test Published Artifact cra5	1m 18s
Test Types with TypeScript 4.8	37s
Test Published Artifact next	1m 3s
Test Types with TypeScript 4.9	41s
Test Published Artifact vite	53s
Test Types with TypeScript 5.0	34s
Test Published Artifact node-standard	19s
Test Types with TypeScript 5.1	33s
Test Published Artifact node-esm	21s
Test Types with TypeScript 5.2	37s
Test Published Artifact react-native	1m 14s
Test Types with TypeScript 5.3	32s
Test Published Artifact expo	1m 13s
Test Types with TypeScript 5.4	31s
	13m 17s

Provide feedback