Upgrade dbt to 1.2.0

Weirdly this isn't working at the moment -- `poetry install` seems to refuse to recognize that `dbt-core` 1.2.0 exists. I'm having issues in another project upgrading dbt, so possibly there's some issue with the release metadata?

It does not seem to be due to python-poetry/poetry#1930 (comment) in this case.

.pre-commit-config.yaml

@@ -28,7 +28,7 @@ repos:
         args: ["--py37-plus"]
   # black should go at the end, since it's the most likely to change others' changes.
   - repo: https://github.com/psf/black
-    rev: "22.1.0"
+    rev: "22.3.0"
     hooks:
       - id: black
   # This doesn't seem to work from pre-commit.ci; which may not have internet access

pyproject.toml

@@ -7,12 +7,13 @@ license = "Apache-2.0"
 name = "dbt-prql"
 readme = "README.md"
 repository = "https://github.com/prql/dbt-prql"
-version = "0.2.1"
+version = "0.2.3"
 
 [tool.poetry.dependencies]
-dbt-core = "~1.1.0"
-prql_python = ">=0.2.0"
-python = ">=3.7"
+python = ">=3.7.3"
+
+dbt-core = "~1.2.0"
+prql_python = ">=0.2.3"
 
 [build-system]
 build-backend = "poetry.core.masonry.api"