Update alpine Docker tag to v3.20 (#120)

* Update alpine Docker tag to v3.20

* Install py3-regex from pip

---------

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>
Co-authored-by: Atsushi Watanabe <[email protected]>

Author: renovate[bot]

Dockerfile

@@ -1,4 +1,4 @@
-ARG ALPINE_VERSION=3.19
+ARG ALPINE_VERSION=3.20
 ARG GOLANG_VERSION=1.23
 
 # ===========================

integrations-builder.Dockerfile

@@ -21,7 +21,6 @@ RUN apk add --no-cache \
     py3-packaging \
     py3-pynacl \
     py3-pip \
-    py3-regex \
     python3-dev \
     patchelf \
     rustup
@@ -42,7 +41,6 @@ RUN git clone --depth=1 https://github.com/DataDog/integrations-core.git /tmp/in
     packaging==$(version py3-packaging) \
     pynacl==$(version py3-pynacl) \
     pip==$(version py3-pip) \
-    regex==$(version py3-regex) \
     "/tmp/integrations-core/datadog_checks_dev[cli]" \
     "/tmp/integrations-core/ddev" \
   && rm -rf /tmp/integrations-core