v0.3.9

SciMLOperators v0.3.9

Diff since v0.3.8

Merged pull requests:

• Bump codecov/codecov-action from 3 to 4 (#235) (@dependabot[bot])
• Correct typo (#240) (@Xuriya)
• Bump julia-actions/setup-julia from 1 to 2 (#241) (@dependabot[bot])
• ci: standardise workflows using SciML's reusable workflows (#242) (@thazhemadam)
• Make sparsearrays into a weak dep ext (#244) (@ChrisRackauckas)