v0.4.0

SemiseparableMatrices v0.4.0

Diff since v0.3.8

Merged pull requests:

• Bump actions/checkout from 3 to 4 (#43) (@dependabot[bot])
• BandedMatrices v1 (#44) (@dlfivefifty)
• Bump actions/cache from 3 to 4 (#46) (@dependabot[bot])
• Bump codecov/codecov-action from 3 to 4 (#47) (@dependabot[bot])
• Bump julia-actions/setup-julia from 1 to 2 (#48) (@dependabot[bot])
• LazyArrays v2.0 support (#49) (@dlfivefifty)