* Fix for HDFFV-10840: Instead of using fill->buf for datatype conversion (#2153)
* Fix for HDFFV-10840: Instead of using fill->buf for datatype conversion
if it is large enough, a buffer is allocated regardless so that the element
in fill->buf can later be reclaimed.
Valgrind is run on test/set_extent.c and there is no memory leak.
* Add information of this fix to release notes.
* Change macos version for CI to macos-11 until accum test failure is fixed for macos
12.
Co-authored-by: Larry Knox <lrknox@hdfgroup.org>
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