Bump spire Helm Chart version from 0.17.2 to 0.18.0 #1271

Job	Run time
checks	1m 7s
Build matrix	3s
lint-chart	32s
upgrade-test (v1.28.0)	8m 41s
test (v1.28.0)	16m 15s
upgrade-test (v1.27.3)	8m 54s
test (v1.27.3)	17m 28s
upgrade-test (v1.26.6)	6m 6s
example-test (v1.28.0, examples/external-postgresql)	3m 9s
test (v1.26.6)	18m 32s
example-test (v1.28.0, examples/nested)	3m 34s
example-test (v1.28.0, examples/external-mysql)	3m 52s
example-test (v1.28.0, examples/federation)	4m 10s
example-test (v1.28.0, examples/tornjak)	2m 47s
example-test (v1.28.0, examples/production)	6m 7s
example-test (v1.27.3, examples/external-postgresql)	3m 10s
example-test (v1.27.3, examples/nested)	4m 16s
example-test (v1.27.3, examples/external-mysql)	4m 5s
example-test (v1.27.3, examples/federation)	3m 41s
example-test (v1.27.3, examples/tornjak)	3m 16s
example-test (v1.27.3, examples/production)	6m 10s
example-test (v1.26.6, examples/external-postgresql)	3m 36s
example-test (v1.26.6, examples/nested)	4m 16s
example-test (v1.26.6, examples/external-mysql)	4m 33s
example-test (v1.26.6, examples/federation)	3m 19s
example-test (v1.26.6, examples/tornjak)	3m 29s
example-test (v1.26.6, examples/production)	6m 5s
	2h 31m 13s

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