Update `storage-initializer` to `v0.13.0` #76

Job	Run time
Get rocks modified and build-scan-test them / Get rockcraft paths modified / Get all rockcraft.yaml paths	5s
Get rocks modified and build-scan-test them / Get rockcraft paths modified / Get paths for ROCKs modified by PR	8s
Get rocks modified and build-scan-test them / build-scan-test-publish-rock (storage-initializer) / build / Build storage-initializer	7m 40s
Get rocks modified and build-scan-test them / build-scan-test-publish-rock (storage-initializer) / sanity-tests / Sanity test storage-initializer:0.13.0	51s
Get rocks modified and build-scan-test them / build-scan-test-publish-rock (storage-initializer) / integration-tests / Test storage-initializer:0.13.0	6m 32s
Get rocks modified and build-scan-test them / build-scan-test-publish-rock (storage-initializer) / scan / Scan storage-initializer:0.13.0	2m 50s
Get rocks modified and build-scan-test them / build-scan-test-publish-rock (storage-initializer) / publish	0s
	18m 6s

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