Bump hashicorp-contrib/setup-packer from 2 to 3 (#20)

Bumps [hashicorp-contrib/setup-packer](https://github.com/hashicorp-contrib/setup-packer) from 2 to 3.
- [Release notes](https://github.com/hashicorp-contrib/setup-packer/releases)
- [Changelog](https://github.com/hashicorp-contrib/setup-packer/blob/master/CHANGELOG.md)
- [Commits](hashicorp-contrib/setup-packer@v2...v3)

---
updated-dependencies:
- dependency-name: hashicorp-contrib/setup-packer
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/packer-publish.yml

@@ -29,7 +29,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
       - name: Use latest Packer # see: https://github.com/marketplace/actions/setup-packer
-        uses: hashicorp-contrib/setup-packer@v2
+        uses: hashicorp-contrib/setup-packer@v3
         with:
           packer-version: 1.8.3
       - name: Validate configuration files

.github/workflows/packer-validate.yml

@@ -12,7 +12,7 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v4
       - name: Use latest Packer  # see: https://github.com/marketplace/actions/setup-packer
-        uses: hashicorp-contrib/setup-packer@v2
+        uses: hashicorp-contrib/setup-packer@v3
         with:
           packer-version: 1.8.3
       - name: Validate configuration files