Dropped Node 16 from CI

refs https://github.com/TryGhost/DevOps/issues/75

- this is no longer supported because we've gone past the EOL date

Author: daniellockyer

.github/workflows/lint-only.yml

@@ -7,7 +7,7 @@ jobs:
     if: github.event_name == 'push' || (github.event_name == 'pull_request' && !startsWith(github.head_ref, 'renovate/'))
     strategy:
       matrix:
-        node: [ 16, 18 ]
+        node: [ 18 ]
     env:
       FORCE_COLOR: 1
     name: Node ${{ matrix.node }}

.github/workflows/test.yml

@@ -10,7 +10,7 @@ jobs:
     if: github.event_name == 'push' || (github.event_name == 'pull_request' && !startsWith(github.head_ref, 'renovate/'))
     strategy:
       matrix:
-        node: [ 16, 18 ]
+        node: [ 18 ]
     env:
       FORCE_COLOR: 1
     name: Node ${{ matrix.node }}