Bump helm/chart-testing-action from 2.4.0 to 2.6.1 #603

Job	Run time
lint-chart	23s
check-docs	3s
Build matrix	5s
Test (v1.21.14, default)	37s
Test (v1.21.14, spire-controller-manager)	26s
Test (v1.21.14, spire-oidc-insecure)	35s
Test (v1.21.14, upstream-authority-disk)	32s
Test (v1.22.15, default)	36s
Test (v1.22.15, spire-controller-manager)	27s
Test (v1.22.15, spire-oidc-insecure)	1m 44s
Test (v1.22.15, upstream-authority-disk)	32s
Test (v1.23.13, default)	23s
Test (v1.23.13, spire-controller-manager)	32s
Test (v1.23.13, spire-oidc-insecure)	35s
Test (v1.23.13, upstream-authority-disk)	32s
Test (v1.24.7, default)	27s
Test (v1.24.7, spire-controller-manager)	30s
Test (v1.24.7, spire-oidc-insecure)	23s
Test (v1.24.7, upstream-authority-disk)	27s
Test (v1.25.3, default)	37s
Test (v1.25.3, spire-controller-manager)	31s
Test (v1.25.3, spire-oidc-insecure)	23s
Test (v1.25.3, upstream-authority-disk)	37s
	11m 57s

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