install psutil required for tests (#132)

* install `psutil` required for tests

* ignore `test_leakcheck.py` while running with valgrind

Author: Vipul-Cariappa

.github/workflows/Ubuntu.yml

@@ -668,6 +668,7 @@ jobs:
         python -m uv pip install pytest
         python -m uv pip install pytest-xdist
         python -m uv pip install numba
+        python -m uv pip install psutil
         echo ::endgroup::
         echo ::group::Run complete test suite
         set -o pipefail
@@ -704,7 +705,7 @@ jobs:
           SUPPRESSION_FILE="../etc/clang${CLANG_VERSION}-valgrind.supp"
         fi
 
-        valgrind --show-error-list=yes --error-exitcode=1 --track-origins=yes --gen-suppressions=all --suppressions="${SUPPRESSION_FILE}" --suppressions=../etc/valgrind-cppyy-cling.supp python -m pytest -m "not xfail" -sv -ra
+        valgrind --show-error-list=yes --error-exitcode=1 --track-origins=yes --gen-suppressions=all --suppressions="${SUPPRESSION_FILE}" --suppressions=../etc/valgrind-cppyy-cling.supp python -m pytest -m "not xfail" -sv -ra --ignore=test_leakcheck.py
         export RETCODE=+$?
         echo ::endgroup::