fix(ci): backport release-v1 CI fixes

Co-authored-by: Miles Cranmer <miles.cranmer@gmail.com>

Author: MilesCranmerBot

.github/workflows/CI.yml

@@ -42,7 +42,7 @@ jobs:
             os: ubuntu-latest
             test-id: include
           - julia-version: '1'
-            python-version: '3.8'
+            python-version: '3.9'
             os: ubuntu-latest
             test-id: include
 

.github/workflows/CI_conda_forge.yml

@@ -20,7 +20,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        python-version: ['3.10', '3']
+        # NOTE: pin to avoid free-threaded Python variants (e.g. 3.14t)
+        python-version: ['3.10', '3.13']
         os: ['ubuntu-latest', 'windows-latest', 'macos-latest']
 
     steps:

.github/workflows/update_backend.yml

@@ -43,8 +43,9 @@ jobs:
           fi
 
       - name: "Create PR if necessary"
-        uses: peter-evans/create-pull-request@v7
+        uses: peter-evans/create-pull-request@v8
         with:
+          branch: backend-update/v${{ steps.get-latest.outputs.version }}
           base: release-v1
           title: "Automated update to backend: v${{ steps.get-latest.outputs.version }}"
           body: |

environment.yml

@@ -2,7 +2,7 @@ name: test
 channels:
   - conda-forge
 dependencies:
-  - python>=3.8
+  - python>=3.9
   - sympy>=1.0.0,<2.0.0
   - pandas>=0.21.0,<4.0.0
   - numpy>=1.13.0,<3.0.0

pyproject.toml

@@ -11,7 +11,7 @@ authors = [
 description = "Simple and efficient symbolic regression"
 readme = {file = "README.md", content-type = "text/markdown"}
 license = {file = "LICENSE"}
-requires-python = ">=3.8"
+requires-python = ">=3.9"
 classifiers = [
     "Programming Language :: Python :: 3",
     "Operating System :: OS Independent",