Update 0xpolygon/polygon-edge Docker tag to v0.8.1

This MR contains the following updates:

Package	Type	Update	Change
0xpolygon/polygon-edge	ironbank-docker	patch	0.8.0 -> 0.8.1
0xpolygon/polygon-edge		patch	0.8.0 -> 0.8.1
0xpolygon/polygon-edge	stage	patch	0.8.0 -> 0.8.1

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