mastodon: bump to 4.0.5

Rolled out to prod and qa.

Change-Id: I0b66ccda2f5ffad812a9654fd7edffe239e7e576
Reviewed-on: https://gerrit.hackerspace.pl/c/hscloud/+/1524
Reviewed-by: ar <ar@hackerspace.pl>
diff --git a/app/mastodon/kube/mastodon.libsonnet b/app/mastodon/kube/mastodon.libsonnet
index 87ca055..826f6fc 100644
--- a/app/mastodon/kube/mastodon.libsonnet
+++ b/app/mastodon/kube/mastodon.libsonnet
@@ -15,7 +15,7 @@
         # /.well-known/webfinger to webDomain.
         webDomain: cfg.localDomain,
         images: {
-            mastodon: "tootsuite/mastodon:v4.0.2@sha256:21c20181a5d44ff553e9e8f7d8d2e53b2551cc8c7ac900760e056445b88e7438",
+            mastodon: "tootsuite/mastodon:v4.0.5@sha256:472c355da5a27b91005dc78c0b5cf75d6baaf1c561c29db1c49ce9168c5de0a9",
         },
         passwords: {
             # generate however you like