CompatHelper: bump compat for DocStringExtensions to 0.9, (keep existing compat)

[github-actions[bot]]

This pull request changes the compat entry for the DocStringExtensions package from ~0.8 to ~0.8, 0.9. 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.

[codecov[bot]]

Codecov Report

Merging #288 (a36af65) into master (890bec7) will increase coverage by 0.00%. The diff coverage is n/a.

@@           Coverage Diff            @@
##           master     #288    +/-   ##
========================================
  Coverage   78.28%   78.28%            
========================================
  Files          43       43            
  Lines        3605     3454   -151     
========================================
- Hits         2822     2704   -118     
+ Misses        783      750    -33     

Flag	Coverage Δ
unittests	78.28% <ø> (+<0.01%)	:arrow_up:

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/common.jl	66.66% <0.00%> (-33.34%)	:arrow_down:
src/utils/utils.jl	64.58% <0.00%> (-1.57%)	:arrow_down:
src/utils/print.jl	52.10% <0.00%> (-1.10%)	:arrow_down:
src/utils/generate_structs.jl	84.82% <0.00%> (-0.90%)	:arrow_down:
src/internal.jl	78.84% <0.00%> (-0.79%)	:arrow_down:
src/probabilistic.jl	77.19% <0.00%> (-0.78%)	:arrow_down:
src/scenarios.jl	83.67% <0.00%> (-0.65%)	:arrow_down:
src/deterministic.jl	81.53% <0.00%> (-0.56%)	:arrow_down:
src/utils/recorder_events.jl	91.39% <0.00%> (-0.53%)	:arrow_down:
src/components.jl	92.56% <0.00%> (-0.52%)	:arrow_down:
... and 17 more