ci: unbreak travis build - drop py3.7, add py3.12

Python 3.7 is unsupported as of June 2023, and no longer supported by tox, one of our dev dependencies.

Python 3.12 was published in October 2023 and is a stable release.

Signed-off-by: Michael Hough <[email protected]>

Author: molepigeon

.travis.yml

@@ -1,12 +1,15 @@
 language: python
 python:
-  - '3.7'
   - '3.8'
   - '3.9'
   - '3.10'
   - '3.11'
+  - '3.12'
 
-dist: focal
+node_js:
+  - 18
+
+dist: jammy
 
 cache: pip
 
@@ -15,11 +18,11 @@ notifications:
 
 matrix:
   include:
-    - python: 3.7
     - python: 3.8
     - python: 3.9
     - python: 3.10
     - python: 3.11
+    - python: 3.12
 
 before_install:
 - npm install npm@latest -g
@@ -51,8 +54,8 @@ deploy:
   skip_cleanup: true
   on:
     branch: main
-    # only on Python 3.7
-    python: '3.7'
+    # only on Python 3.8
+    python: '3.8'
 # ensure semantic-release is functional
 - provider: script
   script:
@@ -61,12 +64,12 @@ deploy:
   on:
     all_branches: true
     # only on 1 matrix job
-    python: '3.7'
+    python: '3.8'
 - provider: pypi
   user: __token__
   password: $PYPI_TOKEN
   repository: https://upload.pypi.org/legacy
   skip_cleanup: true
   on:
-    python: '3.7'
+    python: '3.8'
     tags: true