Use `python3 -m pip` instead of direct `pip`

benchmarks/imaging_shower_ML/config.yml

@@ -37,7 +37,7 @@ ml_shower:training_100:
   stage: process
   needs: ["ml_shower:tagging_epimuphka_100"]#, "ml_shower:tagging_e", "ml_shower:tagging_pi"]
   script:
-    - pip install tensorflow particle
+    - python3 -m pip install tensorflow particle
     - python3 benchmarks/imaging_shower_ML/scripts/ml_training.py -t imcal_epimuphka_100 --pmin 0.5 --pmax 10
 
 ml_shower:training:
@@ -46,7 +46,7 @@ ml_shower:training:
   when: manual
   needs: ["ml_shower:tagging_epimuphka"]#, "ml_shower:tagging_e", "ml_shower:tagging_pi"]
   script:
-    - pip install tensorflow particle
+    - python3 -m pip install tensorflow particle
     - python3 benchmarks/imaging_shower_ML/scripts/ml_training.py -t imcal_epimuphka --pmin 0.5 --pmax 10
 
 ml_shower:test: