chore: fix failing unit tests in `PathTemplateTest` #6923

Job	Run time
build(21) except self-service clients	11m 27s
build (11)	12m 51s
build (17)	12m 15s
build(8) except for gapic-generator-java	4m 9s
build(8) for gapic-generator-java	10m 1s
compatibility	1m 58s
lint	24s
showcase-native	8m 21s
dependency_analyzer_unit_test	14s
gapic-generator-java-bom	1m 52s
showcase (11)	3m 54s
showcase (17)	4m 1s
showcase-clirr	2m 55s
unmanaged_dependency_check	3m 58s
	1h 18m 20s

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