v0.31.5

Hecke v0.31.5

Diff since v0.31.4

Merged pull requests:

• Adjust to flint 3 (#1475) (@thofma)
• fix: simplify for non-monic input (#1492) (@thofma)
• docs: build with warnonly = false (#1493) (@thofma)

Closed issues:

• Stack overflow / segfault in simplify (#1490)