(ci) Remove runners tags

Doesn’t make sense anymore
Was set up to load equaly the load onto the two runners
I am fine with the fact that runners takes the jobs by
themselves dependending on their availabilities

.gitlab-ci.yml

@@ -111,19 +111,16 @@ pre-commit:hooks:
 
 tests:3.7:
   extends: .tests
-  tags: [mille]
   variables:
     PYTHON_VERSION: "3.7"
 
 tests:3.8:
   extends: .tests
-  tags: [redshift]
   variables:
     PYTHON_VERSION: "3.8"
 
 tests:3.9:coverage:
   extends: .tests
-  tags: [redshift]
   coverage: '/(?i)total.*\s+(\d+%)/'
   script:
     - poetry install
@@ -140,7 +137,6 @@ tests:3.9:coverage:
 
 tests:3.10:
   extends: .tests
-  tags: [redshift]
   variables:
     PYTHON_VERSION: "3.10"