Backport of scripts/prepare_changelog: Replace python for with gh and jq commands into release/1.9.x

[hc-github-team-packer]

Backport

This PR is auto-generated from #12689 to be assessed for backporting due to the inclusion of the label backport/1.9.x.

The below text is copied from the body of the original PR.

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This change uses the GitHub CLI to obtain all pull-requests merged after the latest release to help with updating the Packer CHANGELOG.

~>  ./scripts/prepare_changelog.sh v1.9.4
Update LICENSE text - [GH-12686](https://github.com/hashicorp/packer/pull/12686)

docs: amend HCL templates/functions docs - [GH-12672](https://github.com/hashicorp/packer/pull/12672)

build(deps-dev): bump @babel/traverse from 7.17.9 to 7.23.2 in /website - [GH-12658](https://github.com/hashicorp/packer/pull/12658)

init: warn if no requirements specified - [GH-12638](https://github.com/hashicorp/packer/pull/12638)

hcl2template: remove value validation for locals - [GH-12620](https://github.com/hashicorp/packer/pull/12620)

Updating Community Tools webpage - [GH-12612](https://github.com/hashicorp/packer/pull/12612)

Datasource logic cleanup - [GH-12608](https://github.com/hashicorp/packer/pull/12608)

version: prepare v1.9.5-dev - [GH-12602](https://github.com/hashicorp/packer/pull/12602)

Changelog setup 1.9.5 - [GH-12601](https://github.com/hashicorp/packer/pull/12601)

Update version output for `-v` and `--version` flags - [GH-12569](https://github.com/hashicorp/packer/pull/12569)

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Overview of commits

• 3201a97

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