ci: Add another LTS version to Node.js testing matrix

Author: gilmoreorless

.github/workflows/tests.yml

@@ -14,11 +14,12 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        # Use the latest version of Node.js, plus the 2 most recent LTS lines
+        # Use the latest version of Node.js, plus the 3 most recent LTS lines
         node-version:
           - latest
           - lts/*
           - lts/-1
+          - lts/-2 # Probably EOL depending on release schedules, but still good to test
 
     steps:
       - uses: actions/checkout@v3