Bump xlsx from 0.16.7 to 0.16.8

Bumps [xlsx](https://github.com/SheetJS/sheetjs) from 0.16.7 to 0.16.8.
- [Release notes](https://github.com/SheetJS/sheetjs/releases)
- [Changelog](https://github.com/SheetJS/sheetjs/blob/master/CHANGELOG.md)
- [Commits](SheetJS/sheetjs@v0.16.7...v0.16.8)

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package.json

@@ -131,7 +131,7 @@
     "proj4": "2.6.2",
     "promise-polyfill": "8.1.3",
     "three": "0.121.1",
-    "xlsx": "0.16.7",
+    "xlsx": "0.16.8",
     "xml-js": "1.6.8"
   },
   "pre-commit": [