fix: update workflows for renamed test file

Author: yucongalicechen

.github/workflows/matrix-and-codecov-on-merge-to-main.yml

@@ -44,7 +44,7 @@ jobs:
 
       - name: Install diffpy.labpdfproc and requirements
         run: |
-          conda install --file requirements/test.txt
+          conda install --file requirements/tests.txt
           conda install --file requirements/conda.txt
           pip install gooey
           python -m pip install . --no-deps

.github/workflows/tests-on-pr.yml

@@ -34,7 +34,7 @@ jobs:
 
       - name: Install diffpy.labpdfproc and requirements
         run: |
-          conda install --file requirements/test.txt
+          conda install --file requirements/tests.txt
           conda install --file requirements/conda.txt
           pip install gooey
           python -m pip install . --no-deps

news/applymud.rst

@@ -4,7 +4,7 @@
 
 **Changed:**
 
-* <news item>
+* GitHub workflows for renamed test file.
 
 **Deprecated:**