CI gdal-master conda: fix upload of packages

Cf comment in last successfull build:
```
2025-01-04T01:13:22.4654582Z /home/runner/miniconda3/envs/test/lib/python3.12/site-packages/conda_build/cli/main_build.py:520: FutureWarning: The default `pkg_format` of '.tar.bz2' is deprecated and will be removed in 25.1.
2025-01-04T01:13:22.4655579Z
2025-01-04T01:13:22.4655938Z The new default `pkg_format` value will be '.conda'. If you want to keep using `.tar.bz2`, consider:
2025-01-04T01:13:22.4656846Z - Setting `conda_build.pkg_format: 'tar.bz2' in your condarc file.
2025-01-04T01:13:22.4657562Z - Using `--pkg-format=tar.bz2` in the CLI.
2025-01-04T01:13:22.4657835Z
```

Fixes #11676

ci/travis/conda/upload.sh

@@ -20,5 +20,5 @@ fi
 echo "Anaconda token is available, attempting to upload"
 conda install -c conda-forge python=3.12 anaconda-client -y
 
-find . -name "*gdal*.bz2" -exec anaconda -t "$ANACONDA_TOKEN" upload --force --no-progress --user gdal-master  {} \;
+find . -name "*gdal*.conda" -exec anaconda -t "$ANACONDA_TOKEN" upload --force --no-progress --user gdal-master  {} \;