v1.12.3

Commits:

• don't crash if oauth issuer is unreachable d9326e5
• add note about dev keycloak config in jhipster app 4c41762
• add instructions about Android launchMode=singleTask for OAuth2 ba65d34
• don't fail if git doesn't exist, polish spinner succeed messages a784ff1
• fix npm install, remove alias 0e4e473
• add issue template 3318144