chore: reflect recent update of image runner

See https://github.com/actions/runner-images/releases/tag/ubuntu20%2F20250120.2

Author: php-coder

docs/external-dependencies.md

@@ -2,13 +2,13 @@
 
 | Component  | Production               | GitHub Actions                | docker-compose                           |
 | -------    | ------------------------ | ----------------------------- | ---------------------------------------- |
-| OS         | Ubuntu 16.04.07 (Xenial) | Ubuntu 20.04.5 (Focal Fossa)  |                                          |
+| OS         | Ubuntu 16.04.07 (Xenial) | Ubuntu 20.04.6 (Focal Fossa)  |                                          |
 | JDK        | OracleJDK 8u151          | Adopt OpenJDK 8u292           | OpenJDK 8u121-jre on Debian 8.11 (Jessy) |
 | MySQL      | 5.7.27                   | 5.7.20 on Debian 8.11 (Jessy) | 5.7.20 on Debian 8.11 (Jessy)            |
 | PostgreSQL |                          | 11.3 on Debian 9.13 (Stretch) | 11.3 on Debian 9.13 (Stretch)            |
 | Python     | 2.7.12, 3.5.2            | 3.8.10                        |                                          |
 | bash       | 4.3.14                   |                               |                                          |
 | duplicity  | 0.7.06                   |                               |                                          |
-| maven      |                          | 3.8.6                         |                                          |
+| maven      |                          | 3.9.9                         |                                          |
 | ansible    |                          |                               |                                          |
 | Docker API |                          | 1.41                          |                                          |