v1.64.0

ChainRules v1.64.0

Diff since v1.63.0

Merged pull requests:

• correct test muladd so that complex type is included (#786) (@not-physicist)
• Bump julia-actions/setup-julia from 1 to 2 (#789) (@dependabot[bot])
• Generalize rrule for svdvals (#791) (@devmotion)

Closed issues:

• Support for svdvals (#206)
• norm at zero (#538)
• Rule for svdvals (#587)
• muladd test code doesn't test complex numbers. (#753)
• getindex frule behavior (#790)