fix CI bug

Author: cadenmyers13

.github/workflows/test-pdf-pack.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.11, 3.12, 3.13] # requires manual update
+        python-version: [3.13] # requires manual update
     steps:
       - uses: actions/checkout@v4
       - name: Set up conda
@@ -25,9 +25,11 @@ jobs:
       - name: Install diffpy.cmi and dependencies
         run: |
           conda install -y diffpy.cmi
-          for file in requirements/packs/*.txt; do
-            xargs -a "$file" conda install -y -c conda-forge
-          done
+          conda install --file requirements/packs/core.txt -y
+          conda install --file requirements/packs/docs.txt -y
+          conda install --file requirements/packs/pdf.txt -y
+          conda install --file requirements/packs/plotting.txt -y
+          conda install --file requirements/packs/tests.txt -y
       - name: Run diffpy.cmi scripts from docs/examples
         shell: bash
         run: |
@@ -44,24 +46,21 @@ jobs:
       fail-fast: false
       matrix:
         os: [ubuntu-latest, macos-latest, windows-latest]
-        python-version: [3.11, 3.12, 3.13] # requires manual update
+        python-version: [3.13] # requires manual update
     steps:
       - uses: actions/checkout@v4
       - uses: actions/setup-python@v5
         with:
           python-version: ${{ matrix.python-version }}
-      - name: Install diffpy.cmi (pip)
-        run: |
-          python -m pip install --upgrade pip
-          pip install diffpy.cmi
-
-      - name: Install diffpy.cmi and dependencies (pip)
+      - name: Upgrade pip and Install diffpy.cmi and other dependencies
         run: |
           python -m pip install --upgrade pip
           pip install diffpy.cmi
-          for file in requirements/packs/*.txt; do
-            pip install -r "$file"
-          done
+          pip install -r requirements/packs/core.txt
+          pip install -r requirements/packs/docs.txt
+          pip install -r requirements/packs/pdf.txt
+          pip install -r requirements/packs/plotting.txt
+          pip install -r requirements/packs/tests.txt
       - name: Run diffpy.cmi scripts from docs/examples
         shell: bash
         run: |