Drop support for PostgreSQL <9.3

.scrutinizer.yml

@@ -21,7 +21,7 @@ before_commands:
 tools:
     external_code_coverage:
         timeout: 3600
-        runs: 30 # 25x Travis (jobs with COVERAGE=yes) + 3x AppVeyor (jobs with coverage=yes) + 2x ContinuousPHP
+        runs: 29 # 24x Travis (jobs with COVERAGE=yes) + 3x AppVeyor (jobs with coverage=yes) + 2x ContinuousPHP
 
 filter:
     excluded_paths:

.travis.yml

@@ -183,13 +183,6 @@ jobs:
       env: DB=mariadb.mysqli MARIADB_VERSION=10.3 COVERAGE=yes
       addons:
         mariadb: 10.3
-    - stage: Test
-      php: 7.3
-      env: DB=pgsql POSTGRESQL_VERSION=9.2 COVERAGE=yes
-      services:
-        - postgresql
-      addons:
-        postgresql: "9.2"
     - stage: Test
       php: 7.3
       env: DB=pgsql POSTGRESQL_VERSION=9.3 COVERAGE=yes