Fixes searching for pull requests based on commit sha.

Previously, the search query was using the type `pull-request`, but all GitHub documentation points to `pr` being the correct value.

Update to Node 20

Update all examples of action usage to reflect the latest version at …

…this time: v1.6.0

Updates package dependencies and fixes vulnerabilities.

Added `noop-labels` as a list of labels that can be used to ignore a …

…version bump.

Based on the notes in the issue ticket. 
It was uncertain what needed to happen with the outputs when a version is skipped, so for now those outputs are not set. I did add a `skipped` output variable as I use it myself to detect a skip, to make the next step in the job conditional.

If different behaviour is desired, please let me know so it can be adjusted.

Update dependencies (#46)

* npm update

* npm audit fix --force

* Fix badges and update README

Fixed release notes parsing behaviour if a prefix or suffix is defined

Node runtime updated to node16 and updated other dependencies to latest possible

Update most package dependencies to their latest versions

Add `base-branch` option to only consider version tags on the PR base…

… branch

When `base-branch` is set to `true`, the action filters out tags that are not on the PR base branch to find the latest version tag.

Added documentation on workflow permissions required.