fix(theming): update font URL pattern for sap-theming-base-content 11.36.4

In v11.36.4 the @font-face src URLs in css_variables.css changed from
../baseTheme/fonts to ../../../Base/baseLib/baseTheme/fonts, breaking
the CDN URL replacement in the font-face processor.

Author: nnaydenow

packages/base/lib/css-processors/css-processor-font-face.mjs

@@ -12,7 +12,7 @@ const generate = async () => {
         const declarationExpr = /@font-face\s*{[^}]*}/g;
 
         // change font-face src
-        text = text.replaceAll("../baseTheme/fonts", CDN_URL);
+        text = text.replaceAll("../../../Base/baseLib/baseTheme/fonts", CDN_URL);
 
         // extract declarations for separate usage
         let fontFaceDeclarations = [...text.matchAll(declarationExpr)].map(x => x[0]);