Update dependency googletest to 0.12 #641

Job	Run time
Generate full example app	41s
Clippy	1m 4s
Generate default example app	45s
Generate minimal example app	51s
Rust Format	7s
Test	36s
Run Clippy on generated full example app	1s
Build docs for generated full example app	1s
Validate format of generated full example app	1s
Run generated full example app	1s
Test generated full example app	1s
Run Clippy on generated default example app	1s
Build docs for generated default example app	1s
Validate format of generated default example app	1s
Run generators on generated default example app	1s
Run generated default example app	1s
Test generated default example app	1s
Run Clippy on generated minimal example app	1s
Build docs for generated minimal example app	1s
Validate format of generated minimal example app	1s
Run generated minimal example app	1s
Test generated minimal example app	1s
	4m 20s

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