v0.15.9

InfiniteArrays v0.15.9

Diff since v0.15.8

Merged pull requests:

• Define checkindex with AbstractFill only for AbstractInfUnitRange (#220) (@jishnub)
• Add 'min' version to CI workflow matrix (#223) (@jishnub)
• Checkbounds test for mismatched Fill indices (#224) (@jishnub)