update workflows to pin python-3.12 when installing conda-build

[vtavana]

conda-build is not available for python-3.13. In this PR, python-3.12 is pinned to be used when installing conda-build.

LibMambaUnsatisfiableError: Encountered problems while solving:
  - package conda-build-3.0.22-py27h62b9468_0 requires python >=2.7,<2.8.0a0, but none of the providers can be installed

Could not solve for environment specs
The following packages are incompatible
├─ conda-build =* * is installable with the potential options
│  ├─ conda-build [24.1.0|24.1.1|...|3.28.4] would require
│  │  └─ python >=3.10,<3.11.0a0 *, which can be installed;
│  ├─ conda-build [24.1.0|24.1.1|...|3.28.4] would require
│  │  └─ python >=3.11,<3.12.0a0 *, which can be installed;
│  ├─ conda-build [24.1.0|24.1.1|...|25.4.2] would require
│  │  └─ python >=3.12,<3.13.0a0 *, which can be installed;
│  ├─ conda-build [24.1.0|24.1.1|...|3.28.4] would require
│  │  └─ python >=3.8,<3.9.0a0 *, which can be installed;
│  ├─ conda-build [24.1.0|24.1.1|...|3.28.4] would require
│  │  └─ python >=3.9,<3.10.0a0 *, which can be installed;
│  ├─ conda-build [3.0.[22]|3.0.23|...|3.9.2] would require
│  │  └─ python >=2.7,<2.8.0a0 *, which can be installed;
│  ├─ conda-build [3.0.22|3.0.[23]|...|3.9.2] would require
│  │  └─ python >=3.5,<3.6.0a0 *, which can be installed;
│  ├─ conda-build [3.0.22|3.0.23|...|3.9.2] would require
│  │  └─ python >=3.6,<3.7.0a0 *, which can be installed;
│  └─ conda-build [3.10.9|3.11.0|...|3.23.3] would require
│     └─ python >=3.7,<3.8.0a0 *, which can be installed;
└─ pin on python 3.13.* =* * is not installable because it requires
   └─ python =3.13 *, which conflicts with any installable versions previously reported.

Pins seem to be involved in the conflict. Currently pinned specs:
 - python=3.13

[Copilot]

Pull Request Overview

This PR updates the GitHub Actions workflows to pin Python to version 3.12 when installing conda-build, addressing incompatibility issues with Python 3.13.

• Pin Python version to 3.12 during conda-build installation
• Updates made in both conda-package and conda-package-cf workflow files

Reviewed Changes

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

File	Description
.github/workflows/conda-package.yml	Updated conda install commands to include python=3.12
.github/workflows/conda-package-cf.yml	Updated conda install commands to include python=3.12