Align omni-node and polkadot-parachain versions (#7367)

# Description

Aligned `polkadot-omni-node` & `polkadot-parachain` versions. There is
one `NODE_VERSION` constant, in `polkadot-omni-node-lib`, used by both
binaries.

Closes #7276 .

## Integration

Node operators will know what versions of `polkadot-omni-node` &
`polkadot-parachain` they use since their versions will be kept in sync
with the stable release `polkadot` SemVer version.

## Review Notes

TODO:
- [x] update NODE_VERSION of `polkadot-omni-node-lib` when running
branch off workflow

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Signed-off-by: Iulian Barbu <iulian.barbu@parity.io>
(cherry picked from commit 3fb7c8c6)