certbot-dns-cloudflare install fails.

Checklist

• Have you pulled and found the error with jc21/nginx-proxy-manager:latest docker image?
  • Yes
• Are you sure you're not using someone else's docker image?
  • Yes
• Have you searched for similar issues (both open and closed)?
  • Yes

Describe the bug

Installing certbot-dns-cloudflare fails when creating a new SSL certificate

Nginx Proxy Manager Version
2.9.19

To Reproduce
Steps to reproduce the behavior:

1. Login to admin area.
2. Click on SSL Certificates
3. Click on Add SSL Certificate
4. Setup Cloudflare DNS to get a new certificate and click save
5. Produces an error after timeout period

Expected behavior
SSL Certificate is created.

Screenshots
This is the error

[11/8/2022] [12:14:59 PM] [Express  ] › ⚠  warning   Command failed: pip install certbot-dns-cloudflare==$(certbot --version | grep -Eo '[0-9](\.[0-9]+)+') cloudflare

WARNING: Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-cloudflare/

WARNING: Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-cloudflare/

WARNING: Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-cloudflare/

WARNING: Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-cloudflare/

WARNING: Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'ReadTimeoutError("HTTPSConnectionPool(host='pypi.org', port=443): Read timed out. (read timeout=15)")': /simple/certbot-dns-cloudflare/

ERROR: Could not find a version that satisfies the requirement certbot-dns-cloudflare==1.31.0 (from versions: none)

ERROR: No matching distribution found for certbot-dns-cloudflare==1.31.0

Operating System
Ubuntu 20.04 LTS

Additional context
Docker version 20.10.21

docker-compose.yml

version: "3"
services:
  app:
    image: 'jc21/nginx-proxy-manager:latest'
    restart: unless-stopped
    ports:
      # These ports are in format <host-port>:<container-port>
      - '80:80' # Public HTTP Port
      - '443:443' # Public HTTPS Port
      - '81:81' # Admin Web Port
      # Add any other Stream port you want to expose
      # - '21:21' # FTP
    environment:
      DB_MYSQL_HOST: "db"
      DB_MYSQL_PORT: 3306
      DB_MYSQL_USER: "npm"
      DB_MYSQL_PASSWORD: "xxxxxx"
      DB_MYSQL_NAME: "npm"
      # Uncomment this if IPv6 is not enabled on your host
      DISABLE_IPV6: 'true'
    volumes:
      - ./data:/data
      - ./letsencrypt:/etc/letsencrypt
    depends_on:
      - db

  db:
    image: 'jc21/mariadb-aria:latest'
    restart: unless-stopped
    environment:
      MYSQL_ROOT_PASSWORD: 'xxxxxx'
      MYSQL_DATABASE: 'npm'
      MYSQL_USER: 'npm'
      MYSQL_PASSWORD: 'xxxxxx'
    volumes:
      - ./data/mysql:/var/lib/mysql

I've checked my network and the container is able to download other files using curl.

Start at Admin > SSL Certificates > Add SSL Certificate and reproduce the Cloudflare DNS certificate flow in the jc21/nginx-proxy-manager:latest container. Check the logged pip install command and its PyPI timeout; done means the dependency installs and the SSL certificate is created successfully.