Upgrade to snakemd 2.4 (#671)

Author: rzuckerm

.github/CONTRIBUTING.md

@@ -270,10 +270,10 @@ where `<url>` is the website to the image. For example:
 
 Prerequisites:
 
-* [Python 3.9 or better][12]
+* [Python 3.10 or better][12]
 * [pip python package][16]
 * [virtualenv python package][13]
-* [poetry 2.1.1 or better][15]
+* [poetry 2.2.1 or better][15]
 * [Docker][14]
 
 If you wish to build a local copy of the website install the necessary packages:

poetry.lock

@@ -3,11 +3,11 @@ name = "sample-programs-website"
 version = "2025.09.28"
 description = "Sample Programs in Every Programming Language"
 readme = ".github/README.md"
-requires-python = ">=3.9,<4.0"
+requires-python = ">=3.10,<4.0"
 license = {file = "LICENSE" }
 
 dependencies = [
-    "snakemd (>=2.3.0,<2.4.0)",
+    "snakemd (>=2.4.0,<3.0.0)",
     "subete (>=0.21.0,<0.22.0)",
     "image-titler (>=2.4.0,<2.5.0)",
     "glotter2 (>=0.12.1,<0.13.0)",