Fixing constraint of gridtools-cpp

Author: fmalatino

constraints.txt

@@ -170,7 +170,7 @@ googleapis-common-protos==1.63.0
     # via google-api-core
 gprof2dot==2022.7.29
     # via pytest-profiling
-gridtools-cpp==2.3.4
+gridtools-cpp==2.3.8
     # via gt4py
 h5netcdf==1.3.0
     # via ndsl