Update docusaurus to 3.10

Docusaurus 3.10 seems to throw an error on start

[INFO] Docusaurus version: 3.10.1
Node version: v24.15.0
[1] 
[1] [ERROR] TypeError: Cannot read properties of undefined (reading 'mdxCrossCompilerCache')
[1]     at createPagesMDXLoaderRule (/home/joe/repo/openfn/docs/node_modules/@docusaurus/plugin-content-pages/lib/index.js:31:78)
[1]     at Object.pluginContentPages [as plugin] (/home/joe/repo/openfn/docs/node_modules/@docusaurus/plugin-content-pages/lib/index.js:55:38)
[1]     at initializePlugin (/home/joe/repo/openfn/docs/node_modules/@docusaurus/core/lib/server/plugins/init.js:91:61)
[1]     at async Promise.all (index 2)
[1]     at async initPluginsConfigs (/home/joe/repo/openfn/docs/node_modules/@docusaurus/core/lib/server/plugins/init.js:118:22)
[1]     at async initPlugins (/home/joe/repo/openfn/docs/node_modules/@docusaurus/core/lib/server/plugins/init.js:128:39)
[1]     at async externalCommand (/home/joe/repo/openfn/docs/node_modules/@docusaurus/core/lib/commands/external.js:17:21)
[1]     at async createCLIProgram (/home/joe/repo/openfn/docs/node_modules/@docusaurus/core/lib/commands/cli.js:153:9)
[1]     at async runCLI (/home/joe/repo/openfn/docs/node_modules/@docusaurus/core/lib/commands/cli.js:50:21)
[1]     at async file:///home/joe/repo/openfn/docs/node_modules/@docusaurus/core/bin/docusaurus.mjs:44:3
[1] [INFO] Docusaurus version: 3.10.1
[1] Node version: v24.15.0
Job [1], 'docusaurus generate-adaptors' has ended

Don't have time to resolve it now, but I would like a solution soon

Start by reproducing docusaurus generate-adaptors and follow the reported failure through @docusaurus/plugin-content-pages/lib/index.js and @docusaurus/core/lib/server/plugins/init.js. The work is done when the documentation site starts without the mdxCrossCompilerCache TypeError and the command completes successfully.