Upgrade operator-rs to 0.26.1 (#340)

# Description

This doesn't add or change any functionality.

Fixes #335 

Required for #306 

This is based on #333 and has to be merged after that.

:green_circle: CI: https://ci.stackable.tech/view/02%20Operator%20Tests%20(custom)/job/druid-operator-it-custom/39/

## Review Checklist

- [x] Code contains useful comments
- [x] CRD change approved (or not applicable)
- [x] (Integration-)Test cases added (or not applicable)
- [x] Documentation added (or not applicable)
- [x] Changelog updated (or not applicable)
- [x] Cargo.toml only contains references to git tags (not specific commits or branches)
- [x] Helm chart can be installed and deployed operator works (or not applicable)

Once the review is done, comment `bors r+` (or `bors merge`) to merge. [Further information](https://bors.tech/documentation/getting-started/#reviewing-pull-requests)

CHANGELOG.md

@@ -12,13 +12,15 @@ All notable changes to this project will be documented in this file.
 ### Changed
 
 - Updated stackable image versions ([#339]).
+- Upgrade to `operator-rs` `0.26.1` ([#340])
 
 ### Removed
 
 - Retired support for 0.22.1 as it is not build anymore via the docker actions ([#339]).
 
 [#333]: https://github.com/stackabletech/druid-operator/pull/333
 [#339]: https://github.com/stackabletech/druid-operator/pull/339
+[#340]: https://github.com/stackabletech/druid-operator/pull/340
 
 ## [0.8.0] - 2022-11-07