chore(deps): update pydata-sphinx-theme requirement from ~=0.13 to ~=0.15

[dependabot[bot]]

Updates the requirements on pydata-sphinx-theme to permit the latest version.

Release notes

Sourced from pydata-sphinx-theme's releases.

v0.15.2

What's Changed

• Align the search button with other icons by @​12rambau in pydata/pydata-sphinx-theme#1620
• Fix sticky header by @​gabalafou in pydata/pydata-sphinx-theme#1630
• Fix missing sidebar by @​drammock in pydata/pydata-sphinx-theme#1632
• Add missing "footer_center" in layout overview diagram by @​jorisvandenbossche in pydata/pydata-sphinx-theme#1640
• Make bootstrap globally available by @​michael-wisely-gravwell in pydata/pydata-sphinx-theme#1639
• Add Brightway to Featured Example Gallery Grid by @​michaelweinold in pydata/pydata-sphinx-theme#1580
• Move the release instructions to the repository by @​12rambau in pydata/pydata-sphinx-theme#1621
• Make search event listener only trigger with “K”/“k” by @​flying-sheep in pydata/pydata-sphinx-theme#1646
• More speedups to section TOC rendering by @​drammock in pydata/pydata-sphinx-theme#1642
• Allow only theme_footer_center to be set by @​cmarqu in pydata/pydata-sphinx-theme#1653
• Allow user to control the back-to-top button presence by @​12rambau in pydata/pydata-sphinx-theme#1616
• Remove toggle button for secondary sidebar if empty by @​PierreMarchand20 in pydata/pydata-sphinx-theme#1637

New Contributors

• @​michael-wisely-gravwell made their first contribution in pydata/pydata-sphinx-theme#1639
• @​flying-sheep made their first contribution in pydata/pydata-sphinx-theme#1646
• @​cmarqu made their first contribution in pydata/pydata-sphinx-theme#1653
• @​PierreMarchand20 made their first contribution in pydata/pydata-sphinx-theme#1637

Full Changelog: https://github.com/pydata/pydata-sphinx-theme/compare/v0.15.1...v0.15.2

Commits

• 6010af1 bump: 0.15.1 -> 0.15.2
• f420c13 in CIs, pin sphinx dev temporarily
• cfd3cb5 remove toggle button for secondary sidebar if empty (#1637)
• 5fc1452 fix: allow user to control the back-to-top button presence (#1616)
• 80b3e51 Allow only theme_footer_center to be set (#1653)
• 03c73c4 More speedups to section TOC rendering (#1642)
• fff6837 Make search event listener only trigger with “K”/“k” (#1646)
• f50e7b9 fix: move the release instructions to the repository (#1621)
• 2057612 Add Brightway to Featured Example Gallery Grid (#1580)
• 82eabda Make bootstrap globally available (#1639)
• Additional commits viewable in compare view

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