TST: seed the noisy_barometer fixture to fix a pre-existing flake

test_noisy_barometer asserts a barometer reading within rel=0.03 of the clean
pressure, but the reading carries an unseeded Gaussian noise draw plus a
+1000 Pa constant_bias the expected value omits, leaving only ~+2.42 sigma of
headroom, so it already flaked at ~0.76% on develop (a 20k-trial check: develop
0.77%, this branch 0.75%). Passing a fixed seed makes it deterministic and also
exercises the new sensor seed argument.

Author: thc1006

tests/fixtures/sensors/sensors_fixtures.py

@@ -62,6 +62,7 @@ def noisy_barometer():
         operating_temperature=25 + 273.15,
         temperature_bias=0.02,
         temperature_scale_factor=0.02,
+        seed=42,
     )