deps: Bump Amazon.Lambda.Core from 2.5.0 to 2.8.0 #43

Job	Run time
code-quality	43s
build-and-test (ubuntu-latest, 8.0.x)	59s
build-and-test (macos-latest, 8.0.x)	1m 31s
build-and-test (macos-latest, 6.0.x)	1m 36s
build-and-test (ubuntu-latest, 6.0.x)	1m 3s
build-and-test (windows-latest, 6.0.x)	2m 31s
build-and-test (windows-latest, 8.0.x)	2m 16s
	10m 39s

Provide feedback