Use a single interferogram test on slow MacOS GitHub runners

.github/workflows/macos.yml

@@ -56,12 +56,12 @@ jobs:
         export PATH=$PATH:/Users/runner/work/gmtsar/gmtsar/GMTSAR/bin
         ulimit -n 10000
         # remove Google Colab specific commands and add __main__ section
-        cat imperial_valley_2015.py \
+        cat pico_do_fogo_volcano_eruption_2014.py \
             | sed '/if \x27google\.colab\x27 in sys\.modules:/,/^$/d' \
             | sed 's/^[[:blank:]]*!.*$//' \
             | awk '/username = \x27GoogleColab2023\x27/ {print "if __name__ == \x27__main__\x27:"; indent=1} {if(indent) sub(/^/, "    "); print}' \
-            > imperial_valley_2015.fixed.py
-        python3 imperial_valley_2015.fixed.py
+            > pico_do_fogo_volcano_eruption_2014.fixed.py
+        python3 pico_do_fogo_volcano_eruption_2014.fixed.py
     - name: Archive test results
       uses: actions/upload-artifact@v3
       with: