update release version 1.6

Author: tomkralidis

workshop/jupyter/content/notebooks/01-introduction.ipynb

@@ -8,7 +8,7 @@
    "source": [
     "#### Doing Geospatial in Python\n",
     "\n",
-    "Version: 1.6dev, 2025-07-08\n",
+    "Version: 1.6, 2025-07-11\n",
     "\n",
     "<img style=\"float: left;\" src=\"images/geopython-logo.png\">\n",
     "\n",
@@ -158,6 +158,7 @@
     "\n",
     "* [Francesco Bartoli](https://github.com/francbartoli)\n",
     "* [Just van den Broecke](https://github.com/justb4)\n",
+    "* [Seth Girvin](https://github.com/geographika)\n",
     "* [Tom Kralidis](https://twitter.com/tomkralidis)\n",
     "* [Krishna Lodha](https://github.com/krishnaglodha)\n",
     "* [Luís de Sousa](https://github.com/ldesousa)\n",
@@ -167,6 +168,7 @@
     "### Deliveries\n",
     "\n",
     "This workshop has been delivered at the following conferences/events:\n",
+    "* [FOSS4G Europe 2025](https://2025.europe.foss4g.org) (version 1.6)\n",
     "* [FOSS4G 2024](https://2024.foss4g.org) (version 1.5)\n",
     "* [FOSS4G Europe 2024](https://2024.europe.foss4g.org) (version 1.4)\n",
     "* [FOSS4G 2023](https://2023.foss4g.org) (version 1.3)\n",
@@ -208,7 +210,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.11.8"
+   "version": "3.12.3"
   },
   "pycharm": {
    "stem_cell": {