Bump jfreechart from 1.5.1 to 1.5.2

[dependabot-preview]

Bumps jfreechart from 1.5.1 to 1.5.2.

Release notes

Sourced from jfreechart's releases.

JFreeChart 1.5.2

Version 1.5.2 (31 December 2020)

• observe series visibility flag in ClusteredXYBarRenderer (#89);
• apply rendering hints to overlays (#187);
• don't draw disabled outlines on crosshair labels (#189);
• observe axis visibility flag in PeriodAxis (#198);
• ensure label offsets are used in CrosshairOverlay (#190);
• remove alpha channel from copy-to-clipboard (#182);
• set flag in XML parser to avoid XML eXternal Entity injection (XXE) (#130);
• update French translations (#186);
• fix "Save_as" entries in localisation files (#184);
• add flags for visibility of outliers in BoxAndWhiskerRenderer (#79);
• deprecated PiePlot3D and related methods, for 3D pie charts, use Orson Charts (https://github.com/jfree/orson-charts).

Commits

• f37e0fc Add missing Javadocs
• 629ee86 Prepare for release 1.5.2
• 48fbe08 Rearrange image files for Javadocs
• e2f139e Remove unused file.
• 6914316 Add SVG for PiePlot Javadocs.
• 1e7b159 Minor cleanup for generics in DefaultKeyedValues and related classes/interfaces.
• 7dc86b0 Merge pull request #199 from jfree/v1.5.x-tracy
• f8f2dae Added generics to fix bug with PiePlot/PieDataset
• d31fa13 Fix Javadoc warnings.
• 6bef218 Update Javadocs
• Additional commits viewable in compare view

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