[BUG] Unable to get device list

**Describe the bug**
Installed the latest version of IoT Explorer. Added the connection string. While doing the "View devices in hub" it is showing me an error:
Failed to retrieve device list: request to
`https://hub-url/devices%2Fquery?api-version=2020-09-30 failed, reason: unable to get local issuer certificate`

I am getting the same error even if I use Azure AD to authenticate. It use to work and suddenly stopped working in 0.15.8

**To Reproduce**
Steps to reproduce the behavior:
1. Go to 'IoTHubs'
2. Click on 'View Devices in this hub'
4. See error

**Expected behavior**
It should show the device list

**Screenshots**
If applicable, add screenshots to help explain your problem.

**Desktop (please complete the following information):**
- OS: [e.g. Windows, Linux, OSX]

- OS Version Windows 10
- App version 0.15.8/0.15.9

Start by reproducing “View devices in this hub” on Windows 10 with app versions 0.15.8 or 0.15.9, using both a connection string and Azure AD authentication. Trace the request to the devices query endpoint and investigate the reported local issuer certificate failure; done means the device list loads successfully.

Written by the indexing model from the issue text.