chore(deps): update sealed-secrets docker tag to v2.4.8

[renovate]

This PR contains the following updates:

Package	Update	Change
sealed-secrets (source)	patch	2.4.0 -> 2.4.8

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Release Notes

bitnami/charts (sealed-secrets)

v2.4.8

• [bitnami/sealed-secrets] Fix combination of additionalNamespaces, rbac.clusterRole=false and rbac.namespacedRoles=true (#​29872)

v2.4.7

• [bitnami/sealed-secrets] Release 2.4.7 (#​29718) (656a8f8), closes #​29718

v2.4.6

• [bitnami/sealed-secrets] Release 2.4.6 (#​29261) (be159de), closes #​29261

v2.4.5

• [bitnami/sealed-secrets] Release 2.4.5 (#​28749) (08ae0af), closes #​28749

v2.4.4

• [bitnami/sealed-secrets] Release 2.4.4 (#​28472) (185eaed), closes #​28472

v2.4.3

• [bitnami/sealed-secrets] Release 2.4.3 (#​28369) (642152a), closes #​28369

v2.4.2

• [bitnami/sealed-secrets] Release 2.4.2 (#​28156) (0d7dcb7), closes #​28156

v2.4.1

• [bitnami/sealed-secrets] Remove global.storageClass (#​28094) (bed4701), closes #​28094

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