Update base docker image to alpine 3.16 (#1788)

* Update Dockerfile

* Update CHANGELOG.md

CHANGELOG.md

@@ -37,6 +37,8 @@ to remain consistent with CLI flags. You should specify `code_challenge_method`
 
 - [#1762](https://github.com/oauth2-proxy/oauth2-proxy/pull/1762) Support negating for skip auth routes
 
+- [#1788](https://github.com/oauth2-proxy/oauth2-proxy/pull/1788) Update base docker image to alpine 3.16
+
 # V7.3.0
 
 ## Release Highlights

Dockerfile

@@ -1,5 +1,5 @@
 # This ARG has to be at the top, otherwise the docker daemon does not known what to do with FROM ${RUNTIME_IMAGE}
-ARG RUNTIME_IMAGE=alpine:3.15
+ARG RUNTIME_IMAGE=alpine:3.16
 
 # All builds should be done using the platform native to the build node to allow
 #  cache sharing of the go mod download step.