Using `gradle-version: 8.1` is ignored when Gradle 8.10 is on the PATH

When we check if Gradle 8.1 is currently on the PATH, we fail to recognise Gradle 8.10 as something different.

As a result, Gradle 8.1 will not be installed. The following message appears in the logs:
```
Gradle version 8.1 is already available on PATH. Not installing.
```