RP-BCME Tests occasionally fail

[Alexsp32]

Some tests in the test set for BCME methods occasionally fail with the error shown below.

BCME: Test Failed at /home/runner/work/NQCDynamics.jl/NQCDynamics.jl/test/Dynamics/rpbcme.jl:85
  Expression: isapprox(true_value, avg[i]; atol = 5 * err[i], rtol = 0.1)
   Evaluated: isapprox(0.17339235787512292, 0.014280365212307628; atol = 0.15836742286265215, rtol = 0.1)

Stacktrace:
 [1] macro expansion
   @ /opt/hostedtoolcache/julia/1.9.3/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:478 [inlined]
 [2] macro expansion
   @ ~/work/NQCDynamics.jl/NQCDynamics.jl/test/Dynamics/rpbcme.jl:85 [inlined]
 [3] macro expansion
   @ /opt/hostedtoolcache/julia/1.9.3/x64/share/julia/stdlib/v1.9/Test/src/Test.jl:1498 [inlined]
 [4] top-level scope
   @ ~/work/NQCDynamics.jl/NQCDynamics.jl/test/Dynamics/rpbcme.jl:56