Switch back to using the latest ArchLinux docker image

Author: cameel

.circleci/config.yml

@@ -589,9 +589,7 @@ jobs:
 
   b_archlinux:
     docker:
-      # FIXME: Newer releases won't work until CircleCI updates its host machines.
-      # See https://github.com/ethereum/solidity/pull/11332
-      - image: archlinux:base-20210131.0.14634
+      - image: archlinux:base
     environment:
       TERM: xterm
       MAKEFLAGS: -j 3
@@ -730,9 +728,7 @@ jobs:
 
   t_archlinux_soltest: &t_archlinux_soltest
       docker:
-        # FIXME: Newer releases won't work until CircleCI updates its host machines.
-        # See https://github.com/ethereum/solidity/pull/11332
-        - image: archlinux:base-20210131.0.14634
+        - image: archlinux:base
       environment:
         EVM: << pipeline.parameters.evm-version >>
         OPTIMIZE: 0