* gnu/packages/version-control.scm (mercurial): Update to 6.2.1.
[source](patches): Add patch for compatibility with OpenSSL 3.0.
[arguments]: Patch /usr/bin/env and /bin/sh unconditionally in all tests.
Disable four more tests.
[inputs]: Change from PYTHON to PYTHON-WRAPPER.
* gnu/packages/patches/mercurial-openssl-compat.patch: New file.
* gnu/local.mk (dist_patch_DATA): Adjust accordingly.
