python3-pint: upgrade 0.20.1 -> 0.21

Changelog:
==========
- Add PEP621/631 support.
- Exposed matplotlib unit formatter (PR #1703)
- Fix error when when re-registering a formatter.
- Add new SI prefixes: ronna-, ronto-, quetta-, quecto-.
- Fix unit check with 'atol' using 'np.allclose' & 'np.isclose'.
- Implementation for numpy.positive added for Quantity.
- Changed frequency to angular frequency in the docs.
- Remove deprecated 'alen' numpy function
- Updated URLs for log and offset unit errors.
- Patched TYPE_CHECKING import regression.
- Parse '°' along with previous text, rather than adding a space,
  allowing as a unit.
- Improved escaping of special characters for LaTeX format
- Avoid addition of spurious trailing zeros when converting units and non-int-type is
  Decimal (PR #1625).
- Implementation for numpy.delete added for Quantity.
- Fixed Quantity type returned from '__dask_postcompute__'.
- Added Townsend unit
- Fix get_compatible_units() in dynamically added units.
- Fix pint-convert script
- Honor non_int_type when dividing.
- Fix 'trapz', 'dot', and 'cross' to work properly with non-multiplicative units
- Support percent and ppm units. Support the '%' symbol.
- Fix error when parsing subtraction operator followed by white space.
- Removed Td as an alias for denier (within the Textile group)

Signed-off-by: Wang Mingyu <wangmy@fujitsu.com>
Signed-off-by: Khem Raj <raj.khem@gmail.com>

meta-python/recipes-devtools/python/python3-pint_0.21.bb

@@ -10,7 +10,7 @@ PYPI_PACKAGE := "Pint"
 
 inherit pypi ptest python_setuptools_build_meta
 
-SRC_URI[sha256sum] = "387cf04078dc7dfe4a708033baad54ab61d82ab06c4ee3d4922b1e45d5626067"
+SRC_URI[sha256sum] = "3e98bdf01f4dcf840cc0207c0b6f7510d4e0c6288efc1bf470626e875c831172"
 
 DEPENDS += "python3-setuptools-scm-native"