Fix DataDrivenDiffEq.jl downstream test

[contradict]

"Standard" group no longer exists in DataDrivenDiffEq.jl, "Core" looks like a good replacement.

[github-actions]

Benchmark Results

	master	f43ec8c...	t[master]/t[f43ec8c...]
overhead/acrule/a+2	1.06 ± 0.26 μs	1.08 ± 0.26 μs	0.982
overhead/acrule/a+2+b	1.05 ± 0.24 μs	1.07 ± 0.26 μs	0.985
overhead/acrule/a+b	0.354 ± 0.0079 μs	0.356 ± 0.0066 μs	0.995
overhead/acrule/noop:Int	26.9 ± 0.5 ns	26.7 ± 0.4 ns	1.01
overhead/acrule/noop:Sym	0.0457 ± 0.008 μs	0.0455 ± 0.0076 μs	1
overhead/rule/noop:Int	0.0443 ± 0.0016 μs	0.045 ± 0.0019 μs	0.985
overhead/rule/noop:Sym	0.0606 ± 0.0018 μs	0.0571 ± 0.0018 μs	1.06
overhead/rule/noop:Term	0.0581 ± 0.0019 μs	0.0577 ± 0.0018 μs	1.01
overhead/ruleset/noop:Int	0.168 ± 0.0018 μs	0.165 ± 0.0019 μs	1.01
overhead/ruleset/noop:Sym	0.187 ± 0.0042 μs	0.194 ± 0.0054 μs	0.96
overhead/ruleset/noop:Term	4.43 ± 0.31 μs	4.54 ± 0.31 μs	0.975
overhead/simplify/noop:Int	0.228 ± 0.0077 μs	0.232 ± 0.018 μs	0.982
overhead/simplify/noop:Sym	0.248 ± 0.0051 μs	0.243 ± 0.0052 μs	1.02
overhead/simplify/noop:Term	0.0447 ± 0.0036 ms	0.0456 ± 0.0037 ms	0.98
overhead/simplify/randterm (+, *):serial	0.159 ± 0.0015 s	0.163 ± 0.0014 s	0.981
overhead/simplify/randterm (+, *):thread	0.111 ± 0.015 s	0.111 ± 0.016 s	0.994
overhead/simplify/randterm (/, *):serial	0.278 ± 0.0082 ms	0.282 ± 0.0086 ms	0.986
overhead/simplify/randterm (/, *):thread	0.316 ± 0.0096 ms	0.323 ± 0.0097 ms	0.981
overhead/substitute/a	0.0748 ± 0.0015 ms	0.0741 ± 0.0014 ms	1.01
overhead/substitute/a,b	0.0651 ± 0.0015 ms	0.0643 ± 0.0015 ms	1.01
overhead/substitute/a,b,c	21.4 ± 0.6 μs	22.3 ± 0.7 μs	0.96
polyform/easy_iszero	0.0403 ± 0.0031 ms	0.0395 ± 0.003 ms	1.02
polyform/isone	3 ± 0.1 ns	3.1 ± 0.1 ns	0.968
polyform/iszero	2.46 ± 0.03 ms	2.44 ± 0.029 ms	1.01
polyform/simplify_fractions	3.3 ± 0.036 ms	3.29 ± 0.032 ms	1.01
time_to_load	5.46 ± 0.11 s	5.36 ± 0.035 s	1.02

Benchmark Plots

A plot of the benchmark results have been uploaded as an artifact to the workflow run for this PR.
Go to "Actions"->"Benchmark a pull request"->[the most recent run]->"Artifacts" (at the bottom).

[bowenszhu]

Indeed there is no Standard test group.

https://github.com/SciML/DataDrivenDiffEq.jl/blob/3ece13ddc126830ebdf4fd0e14ed9a820f07a1df/test/runtests.jl