Delete old objects when calling `ObjectStore::put` #4581

Job	Run time
check docs (ubuntu-latest / stable)	27s
check examples (ubuntu-latest / stable)	33s
check feature flags (ubuntu-latest / stable)	2m 13s
check format (ubuntu-latest / nightly)	13s
check licenses (ubuntu-latest / stable)	25s
check linter (ubuntu-latest / stable)	58s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	31s
check minimal supported rust version (ubuntu-latest / msrv)	22s
check spelling (ubuntu-latest / nightly)	2m 15s
test (ubuntu-latest / stable)	1m 24s
test (macos-latest / stable)	1m 11s
test (windows-latest / stable)	2m 0s
	12m 32s

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