Update slack.bazel.build (#2174)

diff --git a/slack-bazel-build/docker/nginx.conf b/slack-bazel-build/docker/nginx.conf
index 824f4ca..116e8c3 100644
--- a/slack-bazel-build/docker/nginx.conf
+++ b/slack-bazel-build/docker/nginx.conf
@@ -18,7 +18,7 @@
         listen      ${PORT};
         server_name slack.bazel.build;
 
-        return 301 https://join.slack.com/t/bazelbuild/shared_invite/zt-2uawevx0j-xM4npo6Fy4qbENP_IDwfdw;
+        return 301 https://join.slack.com/t/bazelbuild/shared_invite/zt-2zmd6zz00-Ed4ec3lXHTT9ggLB25GGYA;
 
         error_page   500 502 503 504  /50x.html;
         location = /50x.html {