Update ghcr.io/robert-koch-institut/mex-backend Docker tag to v0.28.0 (…

…#229)

This PR contains the following updates:

| Package | Type | Update | Change |
|---|---|---|---|
|
[ghcr.io/robert-koch-institut/mex-backend](https://redirect.github.com/robert-koch-institut/mex-backend)
| service | minor | `0.25.0` -> `0.28.0` |

---

### Release Notes

<details>
<summary>robert-koch-institut/mex-backend
(ghcr.io/robert-koch-institut/mex-backend)</summary>

###
[`v0.28.0`](https://redirect.github.com/robert-koch-institut/mex-backend/blob/HEAD/CHANGELOG.md#0280---2025-01-15)

[Compare
Source](https://redirect.github.com/robert-koch-institut/mex-backend/compare/0.27.0...0.28.0)

##### Added

-   add `extracted_or_rule_labels` to query builder globals
-   add two matched organizations to the test dummy data

##### Changes

- rename short and obscure cypher query variables to more expressive and
verbose ones
- rename `stable_target_id` to more appropriate `identifier` argument
for merged queries

##### Fixed

- avoid recursive retries in
`GraphConnector._check_connectivity_and_authentication`
-   fix integration tests not properly marked as integration tests

###
[`v0.27.0`](https://redirect.github.com/robert-koch-institut/mex-backend/blob/HEAD/CHANGELOG.md#0270---2024-12-19)

[Compare
Source](https://redirect.github.com/robert-koch-institut/mex-backend/compare/0.26.0...0.27.0)

##### Added

-   configure backoff rules for graph commits
-   validate that the number of merged edges is as intended
-   implement graph flushing connector method
-   add endpoint for flushing the neo4j database (when running in debug)

##### Removed

- remove open-api schema customization, not needed anymore by the
current editor
-   remove purge-script, this is an HTTP endpoint now

###
[`v0.26.0`](https://redirect.github.com/robert-koch-institut/mex-backend/blob/HEAD/CHANGELOG.md#0260---2024-12-18)

[Compare
Source](https://redirect.github.com/robert-koch-institut/mex-backend/compare/0.25.0...0.26.0)

##### Added

-   added an endpoint for getting a person by name from LDAP

##### Changes

-   updated to mex-common 0.45.0 and mex-model 3.4.0

</details>

---

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---

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---

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.github/workflows/testing.yml

@@ -33,7 +33,7 @@ jobs:
         ports:
           - 7687:7687
       backend:
-        image: ghcr.io/robert-koch-institut/mex-backend:0.25.0
+        image: ghcr.io/robert-koch-institut/mex-backend:0.28.0
         env:
           MEX_BACKEND_API_USER_DATABASE: ${{ secrets.MEX_BACKEND_API_USER_DATABASE }}
           MEX_BACKEND_API_KEY_DATABASE: ${{ secrets.MEX_BACKEND_API_KEY_DATABASE }}