Fix invalid URL in bloated.cdx.json test file

The file is used for testing BOM uploads with large files. But one of the `externalReferences` within it are invalid, causing the BOM to be rejected when validation is enabled.

Signed-off-by: nscuro <[email protected]>

Author: nscuro

testdata/boms/bloated.cdx.json

@@ -239316,7 +239316,7 @@
         },
         {
           "type": "issue-tracker",
-          "url": "https://github.com/cssinjs/jss/issues/new?title=[jss-global]"
+          "url": "https://github.com/cssinjs/jss/issues/new?title=%5Bjss-global%5D"
         },
         {
           "type": "vcs",
@@ -378954,4 +378954,4 @@
       ]
     }
   ]
-}
+}