Fix Julia nightly CI failures

[jlchan]

Looks like @invoke and @suppress may be causing nightly CI failures

[codecov[bot]]

Codecov Report

Merging #147 (aebe624) into main (04832c7) will increase coverage by 0.03%. The diff coverage is 60.00%.

@@            Coverage Diff             @@
##             main     #147      +/-   ##
==========================================
+ Coverage   97.75%   97.79%   +0.03%     
==========================================
  Files          25       25              
  Lines        3078     3081       +3     
==========================================
+ Hits         3009     3013       +4     
+ Misses         69       68       -1     

Impacted Files	Coverage Δ
src/ref_elem_utils.jl	89.79% <50.00%> (+2.56%)	:arrow_up:
src/StartUpDG.jl	100.00% <100.00%> (ø)

... and 1 file with indirect coverage changes

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