fix: undeprecate old-style radload (#5069)

* fix: undeprecate old-style radload

This path was used for uncompressed scanlines too.

See #5065

* oops

ready for 8.18.3

Update ChangeLog ahead of v8.18.2 (#4988)

Update ChangeLog ahead of v8.18.1 (#4953)

Update ChangeLog for 8.18 (#4810)

set a release date for 8.18.0

assuming rc3 is the final one heh

fix tiffsave minimise

#4791 set the minimise on the
wrong image, thanks @kleisauke

cplusplus: update Ultra HDR sample after 9e7e75c (#4778)

note version dates

tiffload: ensure docs match memory limit behaviour (#4665)

See commit dcb1df8