fix(deps): allow higher version of importlib-resources for python 3.9 and above

[aberlioz]

The pin on version ^5.12.0 of package importlib-resources was introduced in this PR: #60

It prevents applications running on higher versions of python to install the newest importlib-resources versions.

Considering the usage of the lib, one can argue that we don't even need this dependencies for python version 3.9 and above.

References

• Set correct branch for github actions #60

Submitter checklist

• Recommended: Join WireMock Slack to get any help in #help-contributing or a project-specific channel like #wiremock-java
• The PR request is well described and justified, including the body and the references
• The PR title represents the desired changelog entry
• The repository's code style is followed (see the contributing guide)
• Test coverage that demonstrates that the change works as expected
• For new features, there's necessary documentation in this pull request or in a subsequent PR to wiremock.org

[aberlioz]

Hello @oleg-nenashev 👋🏻 ,
Do you know if someone can please have a look at this 🙏🏻 ?
It should be a very straightforward change.

[oleg-nenashev]

Cc @leeturner

[leeturner]

Fixed in - #120