Release 14.5.0 into trunk

[jaclync]

Releasing new version 14.5.0.

What's Next

PR Author: Be sure to create and publish a GitHub Release pointing to trunk once this PR gets merged,
copy/pasting the following text as the GitHub Release's description:

### New Features

- `openai_ask`: support OpenAI tool-use (function calling) and model overrides. New optional parameters: `tools`, `tool_handlers`, and `max_tool_iterations` enable a multi-turn loop where the model invokes locally-defined tools and receives `role: tool` results until it produces a plain text response or hits the iteration cap; `model` overrides the previously hardcoded `gpt-4o`. Exceptions raised inside a handler are surfaced back to the model as structured `{ error:, exception: }` tool results rather than crashing the lane. [#716]

[Copilot]

Pull request overview

Bumps the Release Toolkit gem to version 14.5.0 and finalizes the 14.5.0 changelog entry by moving the previously-listed feature from Trunk into a dedicated release section.

Changes:

• Bump gem version from 14.4.1 → 14.5.0.
• Update Gemfile.lock to reflect the new plugin version.
• Create a ## 14.5.0 section in CHANGELOG.md and reset Trunk “New Features” to _None_.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
lib/fastlane/plugin/wpmreleasetoolkit/version.rb	Updates the plugin version constant to 14.5.0.
Gemfile.lock	Updates the locked local plugin version to 14.5.0.
CHANGELOG.md	Moves the 14.5.0 feature entry from Trunk into a new ## 14.5.0 section and resets Trunk entries.

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[jaclync]

Merging manually from pre-approval in #717 (review), with the feedback applied in this PR.