Stop providing 'sh' virtual package

pkg.info

@@ -1,7 +1,7 @@
 name: zsh
 description: A powerful interactive shell
 version: "5.9"
-revision: 3
+revision: 4
 url: https://www.zsh.org/
 license: custom
 maintainers:
@@ -15,8 +15,6 @@ make_depends:
   - libcap
   - gdbm
   - libcap
-provides:
-  - sh
 downloads:
   - url: https://downloads.sourceforge.net/project/zsh/zsh/${BPM_PKG_VERSION}/zsh-${BPM_PKG_VERSION}.tar.xz
     extract_to: ${BPM_SOURCE}