Bump conda-incubator/setup-miniconda from 3.0.2 to 3.0.3

Bumps [conda-incubator/setup-miniconda](https://github.com/conda-incubator/setup-miniconda) from 3.0.2 to 3.0.3.
- [Release notes](https://github.com/conda-incubator/setup-miniconda/releases)
- [Changelog](https://github.com/conda-incubator/setup-miniconda/blob/main/CHANGELOG.md)
- [Commits](conda-incubator/setup-miniconda@392cf34...0301788)

---
updated-dependencies:
- dependency-name: conda-incubator/setup-miniconda
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

.github/workflows/nestbuildmatrix.yml

@@ -479,7 +479,7 @@ jobs:
           fetch-depth: 0
 
       - name: Install Conda
-        uses: conda-incubator/setup-miniconda@392cf345b1784333caa1a1185081c71e6ffd61bc   # v3.0.2
+        uses: conda-incubator/setup-miniconda@030178870c779d9e5e1b4e563269f3aa69b04081   # v3.0.3
         with:
           auto-update-conda: true
           python-version: "3.7"