Switch submodule URLs to code.cacert.org

.gitmodules

@@ -1,20 +1,20 @@
 [submodule "cacert_resources"]
 	path = cacert_resources
-	url = gituser@nextgit.gnuviech-server.de:jan/cacert-resources.git
+	url = https://code.cacert.org/cacert/webapp-resources.git
 	branch = main
 [submodule "hydra_config"]
 	path = hydra_config
-	url = gituser@nextgit.gnuviech-server.de:jan/cacert-hydra-config.git
+	url = https://code.cacert.org/cacert/oidc-hydra-config.git
 	branch = main
 [submodule "oidc_app"]
 	path = oidc_app
-	url = gituser@nextgit.gnuviech-server.de:jan/cacert-oidc-app.git
+	url = https://code.cacert.org/cacert/oidc-demo-app.git
 	branch = main
 [submodule "oidc_idp"]
 	path = oidc_idp
-	url = gituser@nextgit.gnuviech-server.de:jan/cacert-oidc-idp.git
+	url = https://code.cacert.org/cacert/oidc-idp.git
 	branch = main
 [submodule "oidc_registration"]
 	path = oidc_registration
-	url = gituser@nextgit.gnuviech-server.de:jan/cacert-oidc-registration.git
+	url = https://code.cacert.org/cacert/oidc-registration.git
 	branch = main