Strip leading zeros from version numbers to make the versioning scheme compatible with SemVer

[matt-mazzucato]

According to #306, a new versioning scheme has been defined and adopted since release 22.11.
However, a number of components relies on semantic versioning (e.g.: the Operator's documentation, which employs Elixir's mix docs to generate documentation pages). Thus, compatibility between the versioning schemes should be ensured to avoid disruptions in the automation we have in place.

We therefore propose to keep on using the CalVer scheme, in a form that makes it compatible with SemVer: this can be obtained by stripping leading zeros from version numbers: i.e. 23.05.00 will become 23.5.0.