Relax upper bound constraints to build with base 4.15

[pepeiborra]

The following packages need their base upper bounds relaxed:

• active
• diagrams-contrib
• diagrams-core
• diagrams-lib
• diagrams-postscript
• diagrams-svg
• dual-tree
• force-layout
• monoid-extras
• statestack
• svg-builder

Thank you for this beautiful stack of libraries!

[ezzieyguywuf]

diagrams-builder needs to be added to this list, and also needs some other upperbounds bumped as well.