Sentry: bump getsentry/sentry from 26.3.1 to 26.4.0 in /services/sentry (#16)

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

services/sentry/docker-compose.yml

@@ -21,7 +21,7 @@ x-restart-policy: &restart_policy
   restart: unless-stopped
 
 x-sentry-defaults: &sentry_defaults
-  image: "${SENTRY_IMAGE:-ghcr.io/getsentry/sentry:26.3.1}"
+  image: "${SENTRY_IMAGE:-ghcr.io/getsentry/sentry:26.4.0}"
   depends_on:
     redis:
       <<: *depends_on-healthy