Log Message:
devel/garden: update to 1.2.0

Released 2023-01-27 - v1.2.0

Features:
- If a garden file has no trees defined at all then an implicit tree called
  `.` will now be synthesized into existence. The presence of this implicit tree
  allows garden files that define just the current directory as a tree to omit
  the entire `trees` section altogether. This consequently makes it easier
  to use garden as a simple command runner because the `commands` section
  is the only section required in order to run `garden` commands.

- When `garden.root` is not configured `garden` will behave as if
  `garden.root` is configured to `${GARDEN_CONFIG_DIR}`. This allows garden
  files to omit `garden.root` from their configuration in typical scenarios.

- Configuring `garden.root` to an empty string (`""`) will behave as if
  `garden.root` is configured to the current directory from which `garden`
  was run.

- When a `garden.yaml` file does not exist in the current directory then garden
  will walk up the file system searching for `garden.yaml` or the name specified
  using `garden -c <name>`. Garden will behave as if it were launched from the
  directory containing the garden file when a configuration file is found.

- The `GARDEN_CEILING_DIRS` and `GIT_CEILING_DIRS` environment variables can be
  used to limit the `garden.yaml` discovery by preventing `garden` from
  traversing into and beyond the specified directories when discovering garden
  files.

- `garden exec`, `garden cmd` `garden grow`, `garden ls` and custom garden
  commands can now filter the trees they operate over by passing a glob pattern
  using `-t | --trees` option. These commands will only operate on the trees
  whose names match the pattern. This allows you to specify a garden as the tree
  query and use the full set of environment variables from all trees in the
  query while executing commands over a subset of the trees in that garden.

- `garden init` will now add the current directory to the `trees` block
  when the current directory contains a Git repository. Use `garden init --empty`
  to disable this behavior.

Development:
- The `shlex` dependency was upgraded to `1.3.0`, which includes fixes for
  [RUSTSEC-2024-0006](https://rustsec.org/advisories/RUSTSEC-2024-0006.html) a.k.a.
  \ 
[GHSA-r7qv-8r2h-pg27](https://github.com/comex/rust-shlex/security/advisories/GHSA-r7qv-8r2h-pg27).