[T/TRM] Slightly relax ctest's tolerances

Tests/Data/ThermoRichardsMechanics/Mockup2D/mockup.prj

@@ -454,7 +454,7 @@
         <vtkdiff>
             <regex>mockup_results_[0-9].*[.]vtu</regex>
             <field>relative_permeability</field>
-            <absolute_tolerance>6.6e-14</absolute_tolerance>
+            <absolute_tolerance>9.1e-14</absolute_tolerance>
             <relative_tolerance>0</relative_tolerance>
         </vtkdiff>
         <vtkdiff>
@@ -466,7 +466,7 @@
         <vtkdiff>
             <regex>mockup_results_[0-9].*[.]vtu</regex>
             <field>relative_permeability_ip</field>
-            <absolute_tolerance>6e-14</absolute_tolerance>
+            <absolute_tolerance>8.2e-14</absolute_tolerance>
             <relative_tolerance>0</relative_tolerance>
         </vtkdiff>
     </test_definition>