Reorder AP changelog and remove duplicated entry [ci skip]

Duplicated entry added in 002dfba66490d289bac897d1ba886310a672e779.
Fix JSON params parsing regression for non-object JSON content.

Backports #8855.
Merge pull request #8888 from dylanahsmith/3-2-parse-non-object-json-params

3-2-stable: Fix JSON params parsing regression for non-object JSON content.
Revert "Merge pull request #7661 from ernie/build-join-records-on-unsaved-hmt"

This reverts commit ee439895759b38431ad025f3c234831f30dadcdb.

It would appear that #7661 had unintended consequences to the API. Until
we can sort those out, this should not be in 3.2.x, and wait for 4.0.0.
Merge pull request #8895 from ernie/revert-hmt-on-unsaved-in-3-2

Revert hm:t on unsaved collection for 3.2
Remove unnecessary caching of ParameterFilter
Merge pull request #8907 from rubys/master

Fix regression introduced in pull 8812