Docker Compose: Bump bluenviron/mediamtx in /tests/perf_tests/compose

Bumps bluenviron/mediamtx from 1.17.1 to 1.18.0.

---
updated-dependencies:
- dependency-name: bluenviron/mediamtx
  dependency-version: 1.18.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

tests/perf_tests/compose/docker-compose-inference_performance.yml

@@ -51,7 +51,7 @@ services:
     init: true
 
   mediaserver:
-    image: bluenviron/mediamtx:1.17.1
+    image: bluenviron/mediamtx:1.18.0
     networks:
       scenescape-test:
         aliases: