Remove support for PostgreSQL 10 (#14392)

Signed-off-by: Sean Quah <seanq@matrix.org>

.ci/scripts/calculate_jobs.py

@@ -54,7 +54,7 @@ trial_postgres_tests = [
     {
         "python-version": "3.7",
         "database": "postgres",
-        "postgres-version": "10",
+        "postgres-version": "11",
         "extras": "all",
     }
 ]

.github/workflows/tests.yml

@@ -409,7 +409,7 @@ jobs:
       matrix:
         include:
           - python-version: "3.7"
-            postgres-version: "10"
+            postgres-version: "11"
 
           - python-version: "3.11"
             postgres-version: "14"

changelog.d/14392.removal

@@ -0,0 +1 @@
+Remove support for PostgreSQL 10.

docs/upgrade.md

@@ -88,6 +88,16 @@ process, for example:
     dpkg -i matrix-synapse-py3_1.3.0+stretch1_amd64.deb
     ```
 
+# Upgrading to v1.72.0
+
+## Dropping support for PostgreSQL 10
+
+In line with our [deprecation policy](deprecation_policy.md), we've dropped
+support for PostgreSQL 10, as it is no longer supported upstream.
+
+This release of Synapse requires PostgreSQL 11+.
+
+
 # Upgrading to v1.71.0
 
 ## Removal of the `generate_short_term_login_token` module API method

synapse/storage/engines/postgres.py

@@ -81,8 +81,8 @@ class PostgresEngine(
         allow_unsafe_locale = self.config.get("allow_unsafe_locale", False)
 
         # Are we on a supported PostgreSQL version?
-        if not allow_outdated_version and self._version < 100000:
-            raise RuntimeError("Synapse requires PostgreSQL 10 or above.")
+        if not allow_outdated_version and self._version < 110000:
+            raise RuntimeError("Synapse requires PostgreSQL 11 or above.")
 
         with db_conn.cursor() as txn:
             txn.execute("SHOW SERVER_ENCODING")