Update sphinxcontrib-mermaid requirement from >=0.9.0 to >=2.1.1

[dependabot]

Updates the requirements on sphinxcontrib-mermaid to permit the latest version.

Changelog

Sourced from sphinxcontrib-mermaid's changelog.

2.1.1 (July 19, 2026)

• Preserve source metadata on generated Mermaid caption nodes so Sphinx extracts them into gettext catalogs and applies normal caption translations
• Pass the existing mermaid image class through the HTML visitor so PNG output can be targeted consistently with CSS

2.1.0 (July 18, 2026)

• Add mermaid_config option for passing a global Mermaid configuration (#215)
• Load the ZenUML plugin lazily, only on pages that contain a ZenUML diagram, and confine its injected stylesheet to the diagram subtree so it no longer restyles the host theme (#252)
• Skip injecting the Mermaid JavaScript when the output format does not support it (#253)
• Fix d3 zoom on nested SVGs (#179)
• Fix fullscreen button positioning inconsistency (#225)
• Fix interactions between the fullscreen, zoom, and lazy-render features (#254)

2.0.3 (July 7, 2026)

• Capture mmdc error message as string for nicer error display
• Fix local JS module imports on root-level pages by ensuring a valid relative ES module specifier (#246)
• Defer rendering of Mermaid diagrams hidden by a parent (e.g. Reveal.js slides, unopened tabs) until they become visible, fixing broken SVGs

2.0.2 (April 30, 2026)

• Add mermaid_dark_theme and mermaid_light_theme config options for configurable theme switching
• Resolve local Mermaid/ELK/ZenUML/D3 JS paths under html_static_path

2.0.1 (March 5, 2026)

• Export runMermaid to window for hot reloading frontend
• Small fixes for docs publishing

2.0.0 (January 13, 2026)

• Drop support for Python 3.8 and 3.9
• Add support for dynamic theme changes

1.2.3 (November 25, 2025)

• Fix issue with ELK charts by upgrading to ELK plugin 0.2.0

1.2.2 (November 23, 2025)

• Hotfix for CSS/JS assets included via old MANIFEST mechanism

1.2.1 (November 23, 2025)

• Adjust chart size defaults to closer resember previous
• Fix issue with fullscreen classes after rebase

1.2.0 (November 23, 2025)

... (truncated)

Commits

• 6e51230 Merge pull request #262 from mgaitan/tkp/211
• 7c61bb6 Merge pull request #264 from mgaitan/dependabot/github_actions/github-actions...
• 77bd593 Merge branch 'master' into dependabot/github_actions/github-actions-a934d7c76e
• d1b8ca8 Merge pull request #265 from mgaitan/tkp/ruff
• 4ad2812 Fixes for ruff 16
• 056261d Bump pypa/gh-action-pypi-publish in the github-actions group
• 015f47a Merge pull request #263 from mgaitan/dependabot/github_actions/github-actions...
• a8f8b59 Bump the github-actions group with 3 updates
• e81147d Bump to 2.1.1 and update changelog
• e267890 Merge pull request #261 from timkpaine/tkp/translate-mermaid-captions
• Additional commits viewable in compare view

[filiperomero2]

@dependabot rebase