Update matplotlib requirement from ~=3.4 to ~=3.6 in /scripts/local-requirements

[dependabot[bot]]

Updates the requirements on matplotlib to permit the latest version.

Release notes

Sourced from matplotlib's releases.

REL: v3.6.0

Highlights of this release include:

• Figure and Axes creation / management
  • subplots, subplot_mosaic accept height_ratios and width_ratios arguments
  • Constrained layout is no longer considered experimental
  • New layout_engine module
  • Compressed layout added for fixed-aspect ratio Axes
  • Layout engines may now be removed
  • Axes.inset_axes flexibility
  • WebP is now a supported output format
  • Garbage collection is no longer run on figure close
• Plotting methods
  • Striped lines (experimental)
  • Custom cap widths in box and whisker plots in bxp and boxplot
  • Easier labelling of bars in bar plot
  • New style format string for colorbar ticks
  • Linestyles for negative contours may be set individually
  • Improved quad contour calculations via ContourPy
  • errorbar supports markerfacecoloralt
  • streamplot can disable streamline breaks
  • New axis scale asinh (experimental)
  • stairs(..., fill=True) hides patch edge by setting linewidth
  • Fix the dash offset of the Patch class
  • Rectangle patch rotation point
• Colors and colormaps
  • Color sequence registry
  • Colormap method for creating a different lookup table size
  • Setting norms with strings
• Titles, ticks, and labels
  • plt.xticks and plt.yticks support minor keyword argument
• Legends
  • Legend can control alignment of title and handles
  • ncol keyword argument to legend renamed to ncols
• Markers
  • marker can now be set to the string "none"
  • Customization of MarkerStyle join and cap style
• Fonts and Text
  • Font fallback
  • List of available font names
  • math_to_image now has a color keyword argument
  • Active URL area rotates with link text
• rcParams improvements
  • Allow setting figure label size and weight globally and separately from title
  • Mathtext parsing can be disabled globally
  • Double-quoted strings in matplotlibrc
• 3D Axes improvements
  • Standardized views for primary plane viewing angles
  • Custom focal length for 3D camera
  • 3D plots gained a 3rd "roll" viewing angle

... (truncated)

Commits

• a302267 REL: v3.6.0
• 5b20854 DOC: Fix a typo in the what's new
• e676dfb DOC: Update version switcher
• 9e6e8d3 Update security policy
• d011a7d Pin to 3.6 version of mpl-sphinx-theme
• 56a5db2 DOC: Update GitHub stats for 3.6.0
• 8490024 Merge branch 'v3.5.x' into HEAD
• e3a8c45 Merge branch 'v3.5.3-doc' into v3.5.x
• df42410 Merge pull request #23814 from QuLogic/relnotes36
• e467be4 Remove redundant behaviour changes in 3.6
• Additional commits viewable in compare view

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