MM-62782: Bumping minimum Postgres version to 13 (#30039)

As discussed in https://docs.mattermost.com/install/prepare-mattermost-database.html#minimum-supported-version-policy

https://mattermost.atlassian.net/browse/MM-62782

```release-note
Minimum postgres version has been bumped to 13.
```

Co-authored-by: Mattermost Build <build@mattermost.com>

e2e-tests/.ci/server.generate.sh

@@ -78,7 +78,7 @@ $(for service in $ENABLED_DOCKER_SERVICES; do
 $(if mme2e_is_token_in_list "postgres" "$ENABLED_DOCKER_SERVICES"; then
     echo '
   postgres:
-    image: mattermostdevelopment/mirrored-postgres:12
+    image: mattermostdevelopment/mirrored-postgres:13
     restart: "no"
     network_mode: host
     networks: !reset []

server/build/docker-compose.common.yml

@@ -41,7 +41,7 @@ services:
     volumes:
       - ./docker/mysql.conf.d/replica.cnf:/etc/mysql/conf.d/mysql.cnf
   postgres:
-    image: "postgres:11"
+    image: "postgres:13"
     restart: always
     networks:
       - mm-test

server/build/docker-preview/Dockerfile

@@ -1,6 +1,6 @@
 # Copyright (c) 2016-present Mattermost, Inc. All Rights Reserved.
 # See License.txt for license information.
-FROM postgres:12
+FROM postgres:13
 
 RUN apt-key adv --keyserver keyserver.ubuntu.com --recv-keys 467B942D3A79BD29
 RUN apt-get update && apt-get install -y ca-certificates

server/channels/store/sqlstore/store.go

@@ -54,7 +54,7 @@ const (
 	// After 10, it's major and minor only.
 	// 10.1 would be 100001.
 	// 9.6.3 would be 90603.
-	minimumRequiredPostgresVersion = 110000
+	minimumRequiredPostgresVersion = 130000
 	// major*1000 + minor*100 + patch
 	minimumRequiredMySQLVersion = 8000
 

server/channels/store/sqlstore/store_test.go

@@ -457,13 +457,13 @@ func TestEnsureMinimumDBVersion(t *testing.T) {
 	}{
 		{
 			driver: model.DatabaseDriverPostgres,
-			ver:    "100001",
+			ver:    "110001",
 			ok:     false,
 			err:    "",
 		},
 		{
 			driver: model.DatabaseDriverPostgres,
-			ver:    "110001",
+			ver:    "130001",
 			ok:     true,
 			err:    "",
 		},
@@ -522,7 +522,7 @@ func TestEnsureMinimumDBVersion(t *testing.T) {
 			store.settings = mySettings
 		}
 		ok, err := store.ensureMinimumDBVersion(tc.ver)
-		assert.Equal(t, tc.ok, ok)
+		assert.Equal(t, tc.ok, ok, "driver: %s, version: %s", tc.driver, tc.ver)
 		if tc.err != "" {
 			assert.Contains(t, err.Error(), tc.err)
 		}