Bump version to v2.48.6. #251

Job	Run time
Cross compile Linux aarch64 (using prebuilt WebRTC)	1m 52s
Lints	8m 16s
Code Formatting	30s
Android Build	5m 26s
Electron Tests (ubuntu-22.04)	2m 12s
RingRTC as dependency (using Prebuilt WebRTC) (ubuntu-22.04)	1m 17s
Electron Tests (windows-latest)	4m 0s
RingRTC as dependency (using Prebuilt WebRTC) (macos-13)	3m 36s
Tests	1m 31s
Electron Tests (macos-13)	6m 41s
RingRTC as dependency (using Prebuilt WebRTC) (windows-latest)	2m 41s
iOS Tests	10m 12s
	48m 14s

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