"https" in URL but "http" in google search results

I've added a free Let's encrypt SSL certificate using certbot(nginx) to my site. Everything works fine but in google search results my site url is displayed as "http://example.com" but when I open the link, in the page url it is displayed as "https://example.com". How do I get it to display the same https url in google search results. I am provinding my nginx server config.

server {
    server_name domain.com www.domain.com;

    location = /favicon.ico { access_log off; log_not_found off; }
    location /static/ {
        root /home/nithish/myproject/home;
    }
    location /media/ {
        root /home/nithish/myproject;
    }
    location / {
        include proxy_params;
        proxy_pass http://unix:/home/nithish/myproject.sock;
    }

    listen 443 ssl; # managed by Certbot
    ssl_certificate /etc/letsencrypt/live/domain.com/fullchain.pem; # managed by Certbot
    ssl_certificate_key /etc/letsencrypt/live/domain.com/privkey.pem; # managed by Certbot
    include /etc/letsencrypt/options-ssl-nginx.conf; # managed by Certbot
    ssl_dhparam /etc/letsencrypt/ssl-dhparams.pem; # managed by Certbot


}
server {
    if ($host = www.domain.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    if ($host = domain.com) {
        return 301 https://$host$request_uri;
    } # managed by Certbot


    listen 80;
    server_name domain.com www.domain.com;
    return 404; # managed by Certbot
}

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