chore: Remove unused certificate generation for OAuth mock

We don't use the certificate generation, so we can remove it.

mocks/oauth/Makefile

@@ -1,22 +1,11 @@
 # SPDX-FileCopyrightText: Copyright DB InfraGO AG and contributors
 # SPDX-License-Identifier: Apache-2.0
 
-CERTS_DIR = ../../certs/
-
-ssl:
-	export MSYS_NO_PATHCONV=1; \
-	openssl req -x509 -out $(CERTS_DIR)localhost.crt -keyout $(CERTS_DIR)localhost.key \
-	-newkey rsa:2048 -nodes -sha256 \
-	-subj '/CN=localhost' \
-	-addext "subjectAltName = DNS:localhost";
-	openssl pkcs12 -export -in $(CERTS_DIR)localhost.crt -inkey $(CERTS_DIR)localhost.key -out $(CERTS_DIR)localhost.p12 -passout "pass:"
-
 start:
 	export MSYS_NO_PATHCONV=1; \
 	docker start oauth-mock || \
 	docker run \
 		--name oauth-mock \
-		-v $$(pwd)/$(CERTS_DIR)localhost.p12:/opt/localhost.p12 \
 		-v $$(pwd)/conf.json:/opt/conf.json \
 		-p 8083:8080 \
 		-e JSON_CONFIG_PATH=/opt/conf.json \