Remove hdf5 pin

[thomashampson]

Description of work

Update to v1.14 of HDF5. This will allow us to move to newer versions of other packages, e.g. boost and libcurl.

Upgrading HDF5 has also enabled the removal of some other pinnings to secondary dependencies (icu, libxml2, openssl) that were originally applied to prevent conda env resolution issues when building the mantidqt package.

Fixes #36974
Fixes #36489

Further detail of work

To test:

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[peterfpeterson]

We could move to cmake v3.28.4 if you don't care about win32. v3.29.0 if you don't care about osx-arm64.

[peterfpeterson]

For some reason, the conda package build is using the 5y old package rather than the one from this week.

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