add missing fn ns declaration

[MikiDi]

Hi!

Building the latest version, (aa6be41) through Docker fails as follows for me:

65.78 [INFO] --- frontend-maven-plugin:1.12.1:npx (generate-sef) @ linkeddatahub ---
65.78 [INFO] Running 'npx xslt3 -t -xsl:/usr/src/platform/target/ROOT/static/com/atomgraph/linkeddatahub/xsl/client.xsl -export:/usr/src/platform/target/ROOT/static/com/atomgraph/linkeddatahub/xsl/client.xsl.sef.json -nogo -ns:##html5 -relocate:on' in /usr/src/platform
66.31 [INFO] npm WARN exec The following package was not found and will be installed: xslt3@2.7.0
66.98 [INFO] SaxonJS 2.7 from Saxonica 
66.98 [INFO] Node.js version v20.8.1
66.98 [INFO] Compiling stylesheet /usr/src/platform/target/ROOT/static/com/atomgraph/linkeddatahub/xsl/client.xsl
82.69 [INFO] Error XPST0081:
82.69 [INFO]   Static error in XPath on line 48 {analyze-string($query-string, '[^a-zA-Z]?(SELECT|ASK|DESCRIBE|CONSTRUCT)[^a-zA-Z]', 'i')/fn:match[1]/fn:group[@nr = '1']/string()}: No namespace binding for prefix 'fn'
82.69 [INFO] Failed to compile stylesheet
82.77 [INFO] npm notice 
82.77 [INFO] npm notice New minor version of npm available! 10.1.0 -> 10.9.0
82.77 [INFO] npm notice Changelog: <https://github.com/npm/cli/releases/tag/v10.9.0>
82.77 [INFO] npm notice Run `npm install -g npm@10.9.0` to update!
82.77 [INFO] npm notice 
82.79 [INFO] ------------------------------------------------------------------------
82.79 [INFO] BUILD FAILURE
82.79 [INFO] ------------------------------------------------------------------------

This change should fix that.

[namedgraph]

Thanks @MikiDi. I noticed this on the develop branch when SaxonJS automatically upgraded to 2.7 (must have stricter namespace checking) but forgot to backport it.

[namedgraph]

Released 4.0.10