Discontinue CI on FreeBSD 11

FreeBSD 11.4 will be EoL on 30-Sept

Author: asomers

.cirrus.yml

@@ -1,7 +1,7 @@
 task:
   name: stable x86_64-unknown-freebsd-11
   freebsd_instance:
-    image: freebsd-11-4-release-amd64
+    image: freebsd-12-2-release-amd64
   setup_script:
     - pkg install -y curl
     - curl https://sh.rustup.rs -sSf --output rustup.sh
@@ -13,20 +13,6 @@ task:
     - LIBC_CI=1 sh ci/run.sh x86_64-unknown-freebsd
     - sh ci/run.sh x86_64-unknown-freebsd
 
-task:
-  name: nightly x86_64-unknown-freebsd-12
-  freebsd_instance:
-    image: freebsd-12-2-release-amd64
-  setup_script:
-    - pkg install -y curl
-    - curl https://sh.rustup.rs -sSf --output rustup.sh
-    - sh rustup.sh --default-toolchain nightly -y --profile=minimal
-    - . $HOME/.cargo/env
-  test_script:
-    - . $HOME/.cargo/env
-    - LIBC_CI=1 sh ci/run.sh x86_64-unknown-freebsd
-    - sh ci/run.sh x86_64-unknown-freebsd
-
 task:
   name: nightly x86_64-unknown-freebsd-13
   freebsd_instance: