- build for modern python on sle15

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- Update to 5.2.0:
  - Update Vega-Lite from version 5.15.1 to version 5.16.3
  - Support offline HTML export using vl-convert
  - Support saving charts as PDF files using the vl-convert
    export engine
  - Support converting charts to sharable Vega editor URLs with
    chart.to_url()
  - Pass format_locale and time_format_locale through to
    vl-convert to support locales in static image export
  - Vega-Altair is now a typed package, with type annotations for
    all public functions and classes and some of the internal
    code
  - Vega-Altair is tested against Python 3.12

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- update to 5.1.2:
  * Update Vega-Lite from version 5.14.1 to version 5.15.1;
  * Remove usage of deprecated Pandas parameter
    ``convert_dtypes`` (#3191)
  * Fix encoding type inference for boolean columns when pyarrow
    is installed (#3210)

  * Replace iteritems with items due to pandas deprecation (#2683).
- Skip python36 build: With NumPy 1.20, Tumbleweed no longer
    *  ``alz.LayerChart`` no longer has ``mark_*()`` methods, because they never

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- Update to 5.1.1:
  * infer dtype pandas fallback
  * The chart.transformed_data() method was added to extract transformed
    chart data
  * Introduction of a new data transformer named vegafusion
  * A JupyterChart class was added to support accessing params and
    selections from Python
  * Support for field encoding inference for objects that support the
    DataFrame Interchange Protocol
  * Add support for new referencing logic in version 4.18 of jsonschema
  * A new transform method transform_extent is available
  * Drop support for Python 3.7 which is end-of-life
  * Hard dependencies: Increase minimum required pandas version to 0.25
  * TitleParam to Title in example gallery and sync scatterplot table
  * Fix bug in reconstructing layered charts with from_json/from_dict
  * Remove extra files in site-packages from wheel
  * Introduction of parameters. There are two types of parameters, selection
    parameters and variable parameters. Variable parameters are new to
    Altair, and while selections are not new, much of the old terminology
    has been deprecated.
  * Grouped bar charts and jitter are now supported using offset channels
  * vl-convert is now used as the default backend for saving Altair charts as
    svg and png files
  * Saving charts with HTML inline is now supported without having
    altair_saver installed.
  * Ordered pandas categorical data are now automatically encoded as sorted
    ordinal data.
  * The Title and Impute aliases were added for TitleParams and ImputeParams
  * More informative autocompletion by removing deprecated methods and for
  * Substantially improved error handling. Both in terms of finding the more

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- update to 4.2.2:
  * Disable uri-reference format check in jsonsschema (#2771).
  * Replace iteritems with items due to pandas deprecation (#2683).

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- Upgrade to 4.2.0:
  - Pie charts are now supported through the use of mark_arc.
  - Support for the datum encoding specifications from Vega-Lite;
    see Vega-Lite Datum Definition.
  - angle encoding can now be used to control point styles
  - Support for serialising pandas nullable data types for float data
  - Automatically create an empty data object when Chart is
    called without a data parameter
  - Allow the use of pathlib Paths when saving charts
  - Support deepcopy for charts
  - Fix to_dict() for nested selections
  - Fix item access for expressions

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