Merge pull request #130 from fluent/update-ci

Update CI

Author: ashie

.github/dependabot.yml

@@ -0,0 +1,6 @@
+version: 2
+updates:
+  - package-ecosystem: 'github-actions'
+    directory: '/'
+    schedule:
+      interval: 'weekly'

.github/workflows/linux.yml

@@ -12,8 +12,8 @@ jobs:
     strategy:
       fail-fast: false
       matrix:
-        ruby: [ '3.1', '3.0', '2.7', '2.6' ]
-        postgres: [ '14', '13', '12', '11', '10', '9' ]
+        ruby: [ '3.2', '3.1', '3.0', '2.7' ]
+        postgres: [ '15', '14', '13', '12', '11' ]
         os:
           - ubuntu-latest
         experimental: [false]
@@ -34,14 +34,6 @@ jobs:
             postgres: '11'
             os: ubuntu-latest
             experimental: true
-          - ruby: head
-            postgres: '10'
-            os: ubuntu-latest
-            experimental: true
-          - ruby: head
-            postgres: '9'
-            os: ubuntu-latest
-            experimental: true
     services:
       postgres:
         image: postgres:${{ matrix.postgres }}