ci: bump python-golioth-tools version

Brings in a change to increase http timeouts in the RPC client to
alleviate CI failures.

Signed-off-by: Sam Friedman <sam@golioth.io>

.github/workflows/hil_test_linux.yml

@@ -49,7 +49,7 @@ jobs:
         pip install --upgrade pip
         pip install pytest pytest-timeout
         pip install tests/hil/scripts/pytest-hil
-        pip install git+https://github.com/golioth/python-golioth-tools@v0.6.3
+        pip install git+https://github.com/golioth/python-golioth-tools@a8b76c12e681e6ec5262def33edc559737677f54
     - name: Install Linux dependencies
       run: |
         sudo apt-get install lcov