Add .postN support to utils::version

[Copilot]

jq/utils.jq only handled strict MAJOR.MINOR.PATCH[-dev] versions, so 0.4.13.post0[-dev] failed parsing and broke actions/version consumers on the workspace branch. This change extends version parsing and next-version calculation to support PEP 440-style post releases without changing plain-version behavior.

• Version parsing

  • Extend utils::version to accept MAJOR.MINOR.PATCH[.postN][-dev]
  • Preserve existing fields for plain versions
  • Add post to the output shape (number or null)

• Next-version semantics

  • Keep existing behavior for plain versions:
    • X.Y.Z-dev -> X.Y.Z
    • X.Y.Z -> X.Y.(Z+1)-dev
  • Add post-release behavior:
    • X.Y.Z.postN-dev -> X.Y.Z.postN
    • X.Y.Z.postN -> X.Y.Z.post(N+1)-dev

• Error handling

  • Replace the old implicit tonumber failure with an explicit error for unsupported version strings

• Fixtures

  • Update existing jq fixtures to include post: null
  • Add jq fixtures covering post-dev parsing, post-release parsing, and post-release bumping
  • Add an actions/version fixture covering 0.4.13.post0

Example:

"0.4.13.post0" | utils::version

{
  "version": "0.4.13.post0",
  "is_dev": false,
  "major": 0,
  "minor": 4,
  "patch": 13,
  "post": 0,
  "next": "0.4.13.post1-dev"
}

Note: workspace branch workflows will need to bump their envoyproxy/toolshed/actions/* pins to an actions-v* release containing this change before .postN releases work there.

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