JuMP v1.22.0

Diff since v1.21.1

Merged pull requests:

• Update donation URL in README (#3727) (@mtanneau)
• [docs] fix donation link (#3728) (@odow)
• Add missing promote_operation method (#3730) (@odow)
• [Containers] add function barrier to getindex (#3731) (@odow)
• Add @nonlinear macro for modifying how expressions are parsed (#3732) (@odow)
• Add methods for Base.complex (#3734) (@odow)
• Update versions in GitHub actions (#3735) (@odow)
• Add tests for issue #3736 (#3737) (@odow)
• Adjust logo light-dark mode in README.md (#3739) (@odow)
• Fix error message if NonlinearExpression is mixed with new NL API (#3741) (@odow)
• Support vector-valued constraints in normalized_coefficient (#3743) (@odow)
• Prep for v1.22 (#3744) (@odow)

Closed issues:

• Poor performance in complementarity models (#3729)
• Add a method for Complex(a,b) (#3733)
• MethodError with empty summations (#3736)
• Should error when trying to mix NonlinearExpression and GenericNonlinearExpr (#3740)
• Support normalized_coefficient for vector-valued constraints (#3742)