Manually bump client release branch from 2.0.7 to 2.0.8

[tyler-cai-microsoft]

Manually bumps the client branch from 2.0.7 to 2.0.8

Also bumps socket.io-adapter to 2.5.5

[jason-ha]

Dependency updates are nice to make as their own explicit change, but okay.
Just make sure the PR description clearly notes that additional change.

[msfluid-bot]

⯅ @fluid-example/bundle-size-tests: +238 Bytes

Metric Name	Baseline Size	Compare Size	Size Diff
aqueduct.js	452.23 KB	452.26 KB	⯅ +35 Bytes
azureClient.js	550.85 KB	550.9 KB	⯅ +49 Bytes
connectionState.js	680 Bytes	680 Bytes	■ No change
containerRuntime.js	256.06 KB	256.07 KB	⯅ +14 Bytes
fluidFramework.js	375.11 KB	375.12 KB	⯅ +7 Bytes
loader.js	133.46 KB	133.47 KB	⯅ +14 Bytes
map.js	41.1 KB	41.11 KB	⯅ +7 Bytes
matrix.js	143.39 KB	143.4 KB	⯅ +7 Bytes
odspClient.js	518.96 KB	519.01 KB	⯅ +49 Bytes
odspDriver.js	97.26 KB	97.28 KB	⯅ +21 Bytes
odspPrefetchSnapshot.js	42.31 KB	42.33 KB	⯅ +14 Bytes
sharedString.js	159.9 KB	159.91 KB	⯅ +7 Bytes
sharedTree.js	375.09 KB	375.1 KB	⯅ +7 Bytes
Total Size	3.22 MB	3.22 MB	⯅ +238 Bytes

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Baseline commit: 2015c59

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