Bump extension version to v0.8.6 #11063

Job	Run time
lint_node	47s
build_node (ubuntu-latest)	1m 19s
Ruby 3.1 on ubuntu-latest	17m 14s
lint_ruby	21s
build_node (macos-latest)	1m 26s
Ruby 3.2 on ubuntu-latest	15m 46s
Verify Jekyll website builds	12s
build_node (windows-latest)	5m 26s
Ruby 3.3 on ubuntu-latest	14m 12s
Ruby 3.1 on macos-latest	9m 45s
Ruby 3.2 on macos-latest	9m 56s
Ruby 3.3 on macos-latest	9m 17s
Ruby 3.1 on windows-latest	21m 25s
Ruby 3.2 on windows-latest	21m 14s
Ruby 3.3 on windows-latest	19m 33s
	2h 27m 53s

Provide feedback