pyproject: bump to 0.6.8a1

pyproject.toml

@@ -1,6 +1,6 @@
 [tool.poetry]
 name = "reflex"
-version = "0.6.8dev1"
+version = "0.6.8a1"
 description = "Web apps in pure Python."
 license = "Apache-2.0"
 authors = [
@@ -108,4 +108,4 @@ asyncio_mode = "auto"
 
 [tool.codespell]
 skip = "docs/*,*.html,examples/*, *.pyi"
-ignore-words-list = "te, TreeE"
+ignore-words-list = "te, TreeE"