Upgrade minimum required Go version to `1.20`

[cthulhu-rider]

• blocked by https://github.com/nspcc-dev/neofs-sdk-go/issues/553

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 48.71795% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 21.89%. Comparing base (3b7d09b) to head (2ff412c).

Files	Patch %	Lines
cmd/neofs-adm/internal/modules/morph/container.go	0.00%	6 Missing :warning:
cmd/blobovnicza-to-peapod/blobovniczatree/put.go	0.00%	3 Missing :warning:
cmd/neofs-cli/internal/client/sdk.go	0.00%	2 Missing :warning:
pkg/local_object_storage/writecache/flush.go	0.00%	2 Missing :warning:
cmd/neofs-cli/internal/key/raw.go	66.66%	1 Missing :warning:
pkg/local_object_storage/engine/engine.go	50.00%	1 Missing :warning:
pkg/local_object_storage/metabase/control.go	0.00%	1 Missing :warning:
pkg/local_object_storage/metabase/shard_id.go	0.00%	1 Missing :warning:
pkg/local_object_storage/util/logicerr/error.go	66.66%	1 Missing :warning:
pkg/services/policer/check.go	0.00%	1 Missing :warning:
... and 1 more

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #2754 +/- ## ========================================== - Coverage 28.65% 21.89% -6.76% ========================================== Files 427 787 +360 Lines 33109 46643 +13534 ========================================== + Hits 9486 10213 +727 - Misses 22771 35554 +12783 - Partials 852 876 +24 ```

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[cthulhu-rider]

pkg/util/salt.go can be improved

done

[roman-khimov]

Conflicts.

[roman-khimov]

Conflicts now.