Update pipeline.yml

Author: jan-janssen

.github/workflows/pipeline.yml

@@ -28,7 +28,7 @@ jobs:
  - name: Setup Mambaforge
 uses: conda-incubator/setup-miniconda@v3
 with:
-python-version: "3.12"
+python-version: "3.11"
 miniforge-version: latest
 condarc-file: .condarc
 environment-file: binder/environment.yml
@@ -46,7 +46,7 @@ jobs:
 run: echo -e "channels:\n - conda-forge\n" > .condarc
  - uses: conda-incubator/setup-miniconda@v3
 with:
-python-version: "3.12"
+python-version: "3.11"
 miniforge-version: latest
 condarc-file: .condarc
 environment-file: binder/environment.yml
@@ -84,7 +84,7 @@ jobs:
  tail --lines=+4 example_workflows/quantum_espresso/environment.yml >> binder/environment.yml
  - uses: conda-incubator/setup-miniconda@v3
 with:
-python-version: "3.12"
+python-version: "3.11"
 miniforge-version: latest
 condarc-file: .condarc
 environment-file: binder/environment.yml
@@ -115,7 +115,7 @@ jobs:
 run: echo -e "channels:\n - conda-forge\n" > .condarc
  - uses: conda-incubator/setup-miniconda@v3
 with:
-python-version: "3.12"
+python-version: "3.11"
 miniforge-version: latest
 condarc-file: .condarc
 environment-file: binder/environment.yml
@@ -143,7 +143,7 @@ jobs:
 run: echo -e "channels:\n - conda-forge\n" > .condarc
  - uses: conda-incubator/setup-miniconda@v3
 with:
-python-version: "3.12"
+python-version: "3.11"
 miniforge-version: latest
 condarc-file: .condarc
 environment-file: documentation/environment.yml