v1.6.4

Ipopt v1.6.4

Diff since v1.6.3

Merged pull requests:

• Update .cirrus.yml (#417) (@amontoison)
• [documentation] Add more details about BLAS and LAPACK backends (#418) (@amontoison)
• Test aarch64-apple on CI (#420) (@odow)
• Upgrade Ipopt to v3.14.16 (#421) (@amontoison)
• Prep for v1.6.4 (#422) (@odow)

Closed issues:

• Segmentation fault during precompilation (#419)