SONAR-17446 drop support postgresql versions 9.6 & 10

.cirrus.yml

@@ -563,7 +563,7 @@ sql_postgres_task:
   <<: *DEFAULT_ARTIFACTS_TEMPLATE
 
 # this is the oldest compatible version of PostgreSQL
-sql_postgres96_task:
+sql_postgres11_task:
   <<: *SKIP_PUBLIC_BRANCHES_TEMPLATE
   <<: *BUILD_DEPENDANT_TASK_TEMPLATE
   <<: *DATABASE_RELATED_NIGHTLY_TASK_TEMPLATE
@@ -573,7 +573,7 @@ sql_postgres96_task:
     memory: 5Gb
     additional_containers:
       - <<: *POSTGRES_ADDITIONAL_CONTAINER_TEMPLATE
-        image: postgres:9.6
+        image: postgres:11
   script:
     - ./private/cirrus/cirrus-db-unit-test.sh postgres
   <<: *DEFAULT_ARTIFACTS_TEMPLATE

server/sonar-docs/src/pages/requirements/requirements.md

@@ -41,8 +41,6 @@ We recommend using the Critical Patch Update (CPU) releases.
 |                                                             | ![](/images/check.svg) 13                                                                                                                                                                                                                                         |
 |                                                             | ![](/images/check.svg) 12                                                                                                                                                                                                                                         |
 |                                                             | ![](/images/check.svg) 11                                                                                                                                                                                                                                         |
-|                                                             | ![](/images/check.svg) 10                                                                                                                                                                                                                                         |
-|                                                             | ![](/images/check.svg) 9.6                                                                                                                                                                                                                                        |
 |                                                             | ![](/images/exclamation.svg) Must be configured to use UTF-8 charset                                                                                                                                                                                              |
 | [Microsoft SQL Server](http://www.microsoft.com/sqlserver/) | ![](/images/check.svg) 2019 (MSSQL Server 15.0) with bundled Microsoft JDBC driver. Express Edition is supported.                                                                                                                                                 |
 |                                                             | ![](/images/check.svg) 2017 (MSSQL Server 14.0) with bundled Microsoft JDBC driver. Express Edition is supported.                                                                                                                                                 |

server/sonar-docs/src/pages/setup/upgrade-notes.md

@@ -13,7 +13,8 @@ SonarQube no longer ships with an embedded version of the documentation. The doc
 * External links that pointed to `/documentation` will be correctly redirected to the corresponding page on the documentation website.
 
 **Update in the Database support**
-Adding support to the latest version 15 of PostgreSQL. supported versions are now from 9.6 to 15.
+* PostgreSQL versions <11 are no longer supported.
+* Adding support to the latest version 15 of PostgreSQL. Supported versions are now from 11 to 15.
 
 [Full release notes](https://sonarsource.atlassian.net/issues/?jql=project%20%3D%2010139%20AND%20fixVersion%20%3D%2013884)