update black formatter

pyproject.toml

@@ -105,7 +105,7 @@ testing = ["coverage==7.4.0", "pytest==7.4.4", "time-machine==2.13.0"]
 
 # Ruff is a linter (a tool to flag stylistic errors, bugs, suspicious constructs, etc.)
 # Black is a code formatter.
-development = ["ruff==0.1.13", "black==23.12.1"]
+development = ["ruff==0.1.13", "black==24.1.1"]
 
 
 # RenderCV uses different tools to check the code quality, format the code, build the
@@ -115,8 +115,9 @@ development = ["ruff==0.1.13", "black==23.12.1"]
 # file automatically.
 
 [tool.black]
-line-length = 88                      # The maximum line length
-experimental_string_processing = true
+line-length = 88                                # The maximum line length
+preview = true
+enable-unstable-feature = ["string_processing"]
 
 [tool.coverage.run]
 source = ['rendercv']