The [Sigma specification's status component](https://github.com/Neo23x0/sigma/wiki/Specification#status-optional) states the following:
> Declares the status of the rule:
> - stable: the rule is considered as stable and may be used in production systems or dashboards.
> - test: an almost stable rule that possibly could require some fine tuning.
> - experimental: an experimental rule that could lead to false results or be noisy, but could also identify interesting events.
However the Sigma Rx YAML specification states the following:
> ```yaml
> status:
> type: //any
> of:
> - type: //str
> value: stable
> - type: //str
> value: testing
> - type: //str
> value: experimental
> ```
The specification confuses the `test` and `testing` state. This commit changes the `test` state into the `testing` state which is already used in the code-base:
- [`sigma/sigma-schema.rx.yml`](a805d18bba/sigma-schema.rx.yml (L49))
- [`sigma/tools/sigma/filter.py`](f3c60a6309/tools/sigma/filter.py (L26))
- [`sigma/tools/sigmac`](4e42bebb34/tools/sigmac (L98))
Although not modifyable through a PR, the specification should furthermore be updated to use the `testing` state.
