chore(deps): update dependency org.postgresql:postgresql to v42.2.11 (#2366)

This PR contains the following updates:

| Package | Update | Change |
|---|---|---|
| [org.postgresql:postgresql](https://togithub.com/pgjdbc/pgjdbc) | patch | `42.2.10` -> `42.2.11` |

---

### Release Notes

<details>
<summary>pgjdbc/pgjdbc</summary>

### [`v42.2.11`](https://togithub.com/pgjdbc/pgjdbc/blob/master/CHANGELOG.md#&#8203;42211-2020-03-07)

##### Changed

-   Reverted [PR 1641](https://togithub.com/pgjdbc/pgjdbc/pull/1252). The driver will now wait for EOF when sending cancel signals. 
-   `DatabaseMetaData#getProcedures` returns only procedures (not functions) for PostgreSQL 11+ [PR 1723](https://togithub.com/pgjdbc/pgjdbc/pull/1723)
-   Convert silent rollbacks into exception if application sends `commit` or `xa.prepare` command [PR 1729](https://togithub.com/pgjdbc/pgjdbc/pull/1729)

##### Added

-   feat: `raiseExceptionOnSilentRollback` connection option to configure if silent rollback should raise an exception [PR 1729](https://togithub.com/pgjdbc/pgjdbc/pull/1729)
-   feat: Expose `ByteStreamWriter` in CopyManager [PR 1702](https://togithub.com/pgjdbc/pgjdbc/pull/1702)
-   feat: add way to distinguish base and partitioned tables in PgDatabaseMetaData.getTables [PR 1708](https://togithub.com/pgjdbc/pgjdbc/pull/1708)
-   refactor: introduce tuple abstraction (rebased) [PR 1701](https://togithub.com/pgjdbc/pgjdbc/pull/1701)
-   refactor: make PSQLState enum consts for integrity constraint violations [PR 1699](https://togithub.com/pgjdbc/pgjdbc/pull/1699)
-   test: add makefile to create ssl certs [PR 1706](https://togithub.com/pgjdbc/pgjdbc/pull/1706)

##### Fixed

-   fix: Always use `.` as decimal separator in PGInterval [PR 1705](https://togithub.com/pgjdbc/pgjdbc/pull/1705)
-   fix: allow DatabaseMetaData.getColumns to describe an unset scale [PR 1716](https://togithub.com/pgjdbc/pgjdbc/pull/1716)

</details>

---

### Renovate configuration

:date: **Schedule**: At any time (no schedule defined).

:vertical_traffic_light: **Automerge**: Disabled by config. Please merge this manually once you are satisfied.

:recycle: **Rebasing**: Never, or you tick the rebase/retry checkbox.

:no_bell: **Ignore**: Close this PR and you won't be reminded about this update again.

---

 - [ ] <!-- rebase-check -->If you want to rebase/retry this PR, check this box

---

This PR has been generated by [WhiteSource Renovate](https://renovate.whitesourcesoftware.com). View repository job log [here](https://app.renovatebot.com/dashboard#GoogleCloudPlatform/java-docs-samples).

Author: renovate-bot

appengine-java8/cloudsql-postgres/pom.xml

@@ -73,7 +73,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.10</version>
+      <version>42.2.11</version>
     </dependency>
 
     <dependency>

cloud-sql/postgres/servlet/pom.xml

@@ -52,7 +52,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.10</version>
+      <version>42.2.11</version>
     </dependency>
     <dependency>
       <groupId>com.google.cloud.sql</groupId>

flexible/postgres/pom.xml

@@ -79,7 +79,7 @@
     <dependency>
       <groupId>org.postgresql</groupId>
       <artifactId>postgresql</artifactId>
-      <version>42.2.10</version>
+      <version>42.2.11</version>
     </dependency>
 
     <dependency>