refactor: remove obsolete __future__ imports in python (#3141)

CI/check_include_guards.py

@@ -1,6 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import print_function
-
 import argparse
 import os
 from glob import glob

CI/fix_pragma.py

@@ -1,6 +1,4 @@
 #!/usr/bin/env python3
-from __future__ import print_function
-
 import argparse
 import os
 from glob import glob

Examples/Scripts/Detectors/TGeoDetector/tgeo-response2json.py

@@ -1,10 +1,12 @@
 #!/usr/bin/env python
 # tgeo-response2json.py - convert TGeo response file options to ACTS v13.0.0 JSON format
 
-
-from __future__ import print_function
-
-import sys, os, re, getopt, json, subprocess
+import sys
+import os
+import re
+import getopt
+import json
+import subprocess
 from collections import OrderedDict