Update plotnine requirement from >=0.15.4 to >=0.15.6 in /Python/rddensity

[dependabot]

Updates the requirements on plotnine to permit the latest version.

Release notes

Sourced from plotnine's releases.

v0.15.6

Bug Fixes

• Fixed last_plot() so that it returns an independent, pristine snapshot of the plot. Previously the plot was stored as a shallow copy and building it mutated shared nested state (e.g. the theme), leaving last_plot() referencing a half-built plot.

Changelog

Sourced from plotnine's changelog.

v0.15.6

(2026-06-08)

Bug Fixes

• Fixed last_plot() so that it returns an independent, pristine snapshot of the plot. Previously the plot was stored as a shallow copy and building it mutated shared nested state (e.g. the theme), leaving last_plot() referencing a half-built plot.

v0.15.5

(2026-06-03)

Bug Fixes

• Fixed the MIME bundle returned for a plot so that binary images (image/png, image/jpeg and application/pdf) are base64-encoded. This makes the bundle valid for consumers that read it directly, e.g. quarto-live's pyodide engine.

v0.15.4

(2026-05-05)

New

• Bundled agent skills

Bug Fixes

• Allow statsmodels==0.14.4 on pyodide, which bundles that version. Other platforms still require statsmodels>=0.14.6 for pandas 3 compatibility.

v0.15.3

(2025-01-28)

Enhancements

• Removed warnings about copy-on-write for pandas >= 3.0.0

v0.15.2

(2025-12-12)

Bug Fixes

• Fixed random failures for when using plotnine in quarto == 1.8.26. {{< issue 1017 >}}

v0.15.1

(2025-09-30)

... (truncated)

Commits

• 406f6b9 DOC: Add changelog entries for v0.15.5 and v0.15.6
• 6e52461 BUG: Deepcopy the plot saved as last_plot
• 0614d19 BUG: Base64-encode binary images in MIME bundle
• See full diff in compare view

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[mdcattaneo]

Reviewed dependency-only Dependabot update; CI is green.