feat(ci): Update silo to 0.2.15 (#2537)

kubernetes/loculus/values.yaml

@@ -1446,7 +1446,7 @@ insecureCookies: false
 bannerMessage: "This is a demonstration environment. It may contain non-accurate test data and should not be used for real-world applications. Data will be deleted regularly."
 additionalHeadHTML: '<script defer data-domain="main.loculus.org" src="https://plausible.io/js/script.js"></script>'
 images:
-  lapisSilo: "ghcr.io/genspectrum/lapis-silo:0.2.14"
+  lapisSilo: "ghcr.io/genspectrum/lapis-silo:0.2.15"
   lapis: "ghcr.io/genspectrum/lapis:0.2.10"
 secrets:
   smtp-password: