Bump to bookworm image for Docker image (#164)

* Bump to bookworm image for Docker image

* Fix legacy syntax on dockerfile

---------

Co-authored-by: rasnar <11248833+Rasnar@users.noreply.github.com>

Author: Rasnar

docker/Dockerfile

@@ -1,12 +1,12 @@
-FROM python:3.9.12-slim-buster
+FROM python:3.9.22-slim-bookworm
 
 # set CERT paths for python libraries, necessary for self-signed certificates
 #  - Requests Library
 #  -> https://docs.python-requests.org/en/master/user/advanced/#ssl-cert-verification
-ENV REQUESTS_CA_BUNDLE /etc/ssl/certs/ca-certificates.crt
+ENV REQUESTS_CA_BUNDLE=/etc/ssl/certs/ca-certificates.crt
 #  - openssl
 #  -> https://www.openssl.org/docs/man1.1.1/man3/SSL_CTX_set_default_verify_paths.html
-ENV SSL_CERT_FILE /etc/ssl/certs/ca-certificates.crt
+ENV SSL_CERT_FILE=/etc/ssl/certs/ca-certificates.crt
 
 COPY . /src
 COPY docker/run.sh /opt/docker/run.sh