fix[next]: Fix syntax warnings

[iomaganaris]

Fix the following warnings:

/capstor/scratch/cscs/ioannmag/beverin/cycl35/icon4py-JW/.venv/lib/python3.12/site-packages/gt4py/next/config.py:137: SyntaxWarning: invalid escape sequence '.'
warnings.filterwarnings(action="ignore", module="^dace(..+)?")
/capstor/scratch/cscs/ioannmag/beverin/cycl35/icon4py-JW/.venv/lib/python3.12/site-packages/gt4py/next/config.py:139: SyntaxWarning: invalid escape sequence '.'
action="ignore", module="^gt4py.next.program_processors.runners.dace.transformations(..+)?"