Freezing docs OS at ubuntu-24.04 and jupyter-book v1 (#103)

* freezing docs os at ubuntu-24.04

tackling error with jupyter-book v2:

https://github.com/HPSCTerrSys/TSMP2/actions/runs/19062616900/job/54457352635

* docs: hard-code jupyter-book to v1

Author: jjokella

.github/workflows/docs.yml

@@ -20,7 +20,7 @@ concurrency:
 
 jobs:
   build:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     steps:
       - uses: actions/checkout@v4
         with:
@@ -52,7 +52,7 @@ jobs:
   deploy:
     if: github.event_name != 'pull_request'
     needs: build
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-24.04
     environment:
       name: github-pages
       url: ${{ steps.deployment.outputs.page_url }}

docs/requirements.txt

@@ -1,4 +1,4 @@
-jupyter-book
+jupyter-book < 2
 matplotlib
 numpy
 ghp-import