v0.3.6

SemiseparableMatrices v0.3.6

Diff since v0.3.5

Merged pull requests:

• enable dependabot for GitHub actions (#36) (@ranocha)
• Bump actions/checkout from 2 to 3 (#37) (@dependabot[bot])
• Bump actions/cache from 1 to 3 (#38) (@dependabot[bot])
• Bump codecov/codecov-action from 1 to 3 (#39) (@dependabot[bot])
• Julia v1.9 (#40) (@dlfivefifty)
• FillArrays v1 (#41) (@dlfivefifty)