chore(deps): update python docker tag to v3.9 (#3)

renovate[bot] · renovate-bot · web-flow · commit 8080fece7ac2 · 2021-04-29T12:58:56.000-06:00
Co-authored-by: Renovate Bot &lt;bot@renovateapp.com&gt;
diff --git a/Dockerfile b/Dockerfile
@@ -1,4 +1,4 @@
-FROM python:3.8
+FROM python:3.9
 
 RUN python -m pip install --upgrade pip
 RUN pip install pipx

Original file line number	Diff line number	Diff line change
`@@ -1,4 +1,4 @@`
`1`		`-FROM python:3.8`
	`1`	`+FROM python:3.9`
`2`	`2`
`3`	`3`	`RUN python -m pip install --upgrade pip`
`4`	`4`	`RUN pip install pipx`