CompatHelper: bump compat for DynamicExpressions to 1.9, (keep existing compat)

[github-actions]

This pull request changes the compat entry for the DynamicExpressions package from ~1.8 to ~1.8, 1.
This keeps the compat entries for earlier versions.

Note: I have not tested your package with this new compat entry.
It is your responsibility to make sure that your package tests pass before you merge this pull request.

[github-actions]

Benchmark Results

	master	f7c2cfb...	master/f7c2cfbf330b54...
search/multithreading	17.1 ± 1.3 s	17.9 ± 1.1 s	0.96
search/serial	28.3 ± 0.3 s	28.6 ± 0.18 s	0.989
utils/best_of_sample	1.84 ± 1.4 μs	1.64 ± 0.38 μs	1.12
utils/check_constraints_x10	11.2 ± 2.9 μs	11 ± 2.8 μs	1.01
utils/compute_complexity_x10/Float64	2.08 ± 0.12 μs	2.06 ± 0.12 μs	1.01
utils/compute_complexity_x10/Int64	2.05 ± 0.13 μs	2.03 ± 0.11 μs	1.01
utils/compute_complexity_x10/nothing	1.42 ± 0.12 μs	1.44 ± 0.13 μs	0.987
utils/insert_random_op_x10	5.82 ± 1.9 μs	5.92 ± 1.9 μs	0.983
utils/next_generation_x100	0.424 ± 0.099 ms	0.355 ± 0.086 ms	1.2
utils/optimize_constants_x10	0.034 ± 0.0081 s	0.0333 ± 0.0078 s	1.02
utils/randomly_rotate_tree_x10	5.36 ± 0.62 μs	5.21 ± 0.58 μs	1.03
time_to_load	1.85 ± 0.0098 s	1.83 ± 0.014 s	1.01

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).

[coveralls]

Pull Request Test Coverage Report for Build 12440642187

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 94.754%

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Totals
Change from base Build 12342023114:	0.03%
Covered Lines:	3143
Relevant Lines:	3317

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💛 - Coveralls