Build failure when mvn compile

I downloaded the source zip (from https://github.com/google/s2-geometry-library-java/archive/refs/heads/master.zip) and then:

1. `mvn clean` -> OK
2. `mvn compile` ->
```
[ERROR] Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project s2-geometry-library: Compilation failure: Compilation failure:
[ERROR] Source option 5 is no longer supported. Use 7 or later.
[ERROR] Target option 5 is no longer supported. Use 7 or later.
[ERROR] -> [Help 1]
```

Linux system:

- Linux Mint 21.3 Cinnamon
- 5.15.0-142-generic
- Intel© Core™ i7-10850H CPU @ 2.70GHz × 6

OK I found the fix. I added these 2 lines in the `properties` section of the `pom.xml` file:
`11`
`11`