v0.42.7

AbstractAlgebra v0.42.7

Diff since v0.42.6

Merged pull requests:

• feat: add coprime base (#1785) (@thofma)
• feat: generalize ideal(...) fallbacks (#1788) (@thofma)
• Fix uses of unsafe arithmatics (#1790) (@lgoettgens)
• chore: bump to 0.42.7 (#1791) (@thofma)