Have postgis_extensions_upgrade set extversion to ANY prior to update

This allows upgrading from any version of PostGIS even if no
specific upgrade script exists on disk (which often happens as
we support multiple stable branches).

Author: strk

NEWS

@@ -5,6 +5,8 @@ PostGIS 3.3.0dev
   - ...
 
  * Enhancements *
+  - postgis_extensions_upgrade() support for upgrades from any PostGIS
+    version, including yet to be released ones (Sandro Santilli)
   - #5037, add convexhull 3D (Loïc Bartoletti)
   - #5040, add postgis_sfcgal_full_version (Loïc Bartoletti)
   - GH655, GiST: balance the tree splits better in recursive calls (Darafei Praliaskouski)

postgis/postgis.sql.in

@@ -3034,28 +3034,16 @@ BEGIN
 			ELSE
 				RAISE DEBUG 'Skipping % (not in use)', rec.name;
 			END IF;
-		ELSIF target_version != rec.installed_version
-		THEN --}{
-			sql = 'ALTER EXTENSION ' || rec.name || ' UPDATE TO ' ||
-						quote_ident(target_version)   || ';';
+		ELSE -- IF target_version != rec.installed_version THEN --}{
+			sql = format(
+				'UPDATE pg_catalog.pg_extension SET extversion = ''ANY'' WHERE extname = %1$L;'
+				'ALTER EXTENSION %1$I UPDATE TO %2$I',
+				rec.name, target_version
+			);
 			RAISE NOTICE 'Updating extension % %',
 				rec.name, rec.installed_version;
 			RAISE DEBUG '%', sql;
 			EXECUTE sql;
-		ELSIF (target_version = rec.installed_version AND rec.installed_version ILIKE '%dev') OR
-			(@extschema@._postgis_pgsql_version() != @extschema@._postgis_scripts_pgsql_version())
-		THEN --}{
-			-- we need to upgrade to next and back
-			RAISE NOTICE 'Updating extension % % (self refresh)',
-				rec.name, rec.installed_version;
-			sql = 'ALTER EXTENSION ' || rec.name || ' UPDATE TO ' ||
-						quote_ident(target_version || 'next')   || ';';
-			RAISE DEBUG '%', sql;
-			EXECUTE sql;
-			sql = 'ALTER EXTENSION ' || rec.name || ' UPDATE TO ' ||
-						quote_ident(target_version)   || ';';
-			RAISE DEBUG '%', sql;
-			EXECUTE sql;
 		END IF; --}
 
 	END LOOP; --}