Remove darcs and mercurial

Author: cknitt

.github/workflows/ci.yml

@@ -106,7 +106,7 @@ jobs:
           # https://github.com/ocaml/setup-ocaml/blob/2f57267f071bc8547dfcb9433ff21d44fffef190/packages/setup-ocaml/src/unix.ts#L48
           # plus OPAM wants cmake
           sudo apt-get update
-          sudo apt-get install -y bubblewrap darcs g++-multilib gcc-multilib mercurial musl-tools rsync cmake
+          sudo apt-get install -y bubblewrap g++-multilib gcc-multilib musl-tools rsync cmake
 
       - name: Restore rewatch build cache
         id: rewatch-build-cache

.github/workflows/coverage.yml

@@ -42,7 +42,7 @@ jobs:
       - name: Install system dependencies
         run: |
           sudo apt-get update
-          sudo apt-get install -y bubblewrap darcs g++-multilib gcc-multilib mercurial musl-tools rsync cmake
+          sudo apt-get install -y bubblewrap g++-multilib gcc-multilib musl-tools rsync cmake
 
       # --- rewatch build cache ---------------------------------------------
       # `make coverage` shells out to `make` which builds rewatch; cache the