Update europe-docker.pkg.dev/kyma-project/prod/external/golang Docker tag to v1.21.4 - autoclosed

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
europe-docker.pkg.dev/kyma-project/prod/external/golang	stage	patch	1.21.3-alpine3.18 -> 1.21.4-alpine3.18

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