Remove FreeBSD 11 from libc CI

FreeBSD 11 is EOL and recently ceased hosting packages for that version of the OS, which is causing libc CI to fail.

Author: Amanieu

cfg.production.toml

@@ -150,8 +150,6 @@ secret = "${HOMU_WEBHOOK_SECRET_LIBC}"
 
 [repo.libc.checks.actions]
 name = "bors build finished"
-[repo.libc.checks.cirrus-freebsd-11]
-name = "stable x86_64-unknown-freebsd-11"
 [repo.libc.checks.cirrus-freebsd-12]
 name = "nightly x86_64-unknown-freebsd-12"
 [repo.libc.checks.cirrus-freebsd-13]
@@ -404,4 +402,4 @@ try_users = []
 [repo.rust-analyzer.github]
 secret = "${HOMU_WEBHOOK_SECRET_RUST_ANALYZER}"
 [repo.rust-analyzer.checks.actions]
-name = "bors build finished"
+name = "bors build finished"