Add TABULATOR_VERSION to links

examples/reference/widgets/Tabulator.ipynb

@@ -185,7 +185,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "The list of valid *Tabulator* formatters can be found in the [Tabulator documentation](https://tabulator.info/docs/5.5/format#format-builtin).\n",
+    "The list of valid *Tabulator* formatters can be found in the [Tabulator documentation](https://tabulator.info/docs/{{TABULATOR_VERSION}}/format#format-builtin).\n",
     "\n",
     "Note that the equivalent specification may also be applied for column titles using the `title_formatters` parameter (but does not support Bokeh `CellFormatter` types)."
    ]
@@ -1369,7 +1369,7 @@
    "cell_type": "markdown",
    "metadata": {},
    "source": [
-    "These and other available *Tabulator* options are listed at http://tabulator.info/docs/5.4/options.  \n",
+    "These and other available *Tabulator* options are listed at http://tabulator.info/docs/{{TABULATOR_VERSION}}/options.  \n",
     "\n",
     "Obviously not all options will work though, especially any settable callbacks and options which are set by the internal Panel tabulator module (for example the `columns` option).\n",
     "Additionally it should be noted that the configuration parameter is not responsive so it can only be set at instantiation time."