gomod(deps): bump github.com/go-git/go-billy/v5 from 5.5.0 to 5.6.0 (… #122

Job	Run time
builds / compute-tags	2s
builds / build-serverless-webhook / Build image	3m 28s
builds / build-serverless-controller / Build image	4m 10s
builds / build-operator / Build image	3m 23s
builds / build-nodejs20 / Build image	2m 16s
builds / build-nodejs22 / Build image	2m 12s
builds / build-python312 / Build image	2m 38s
builds / build-serverless-jobinit / Build image	2m 58s
integrations / gardener-integration-test	34s
integrations / git-auth-integration-test	2m 40s
integrations / serverless-integration-test	9m 38s
integrations / operator-integration-test	2m 20s
upgrades / operator-upgrade-test	2m 44s
upgrades / serverless-upgrade-test	9m 22s
	48m 25s

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