Snap config changes (#44964)

eng/Versions.props

@@ -8,7 +8,7 @@
     <MajorVersion>3</MajorVersion>
     <MinorVersion>7</MinorVersion>
     <PatchVersion>0</PatchVersion>
-    <PreReleaseVersionLabel>3</PreReleaseVersionLabel>
+    <PreReleaseVersionLabel>4</PreReleaseVersionLabel>
     <VersionPrefix>$(MajorVersion).$(MinorVersion).$(PatchVersion)</VersionPrefix>
     <!--
       By default the assembly version in official builds is "$(MajorVersion).$(MinorVersion).0.0".

eng/config/PublishData.json

@@ -72,12 +72,12 @@
       "vsBranch": "rel/d16.6",
       "vsMajorVersion": 16
     },
-    "release/dev16.7-preview2-vs-deps": {
+    "release/dev16.7-preview3-vs-deps": {
       "nugetKind": ["Shipping", "NonShipping"],
       "version": "3.7.*",
       "nuget": [ "https://dotnet.myget.org/F/roslyn/api/v2/package" ],
       "vsix": [ "https://dotnet.myget.org/F/roslyn/vsix/upload" ],
-      "channels": [ "dev16.7", "dev16.7p2" ],
+      "channels": [ "dev16.7", "dev16.7p3" ],
       "vsBranch": "master",
       "vsMajorVersion": 16
     },
@@ -86,10 +86,19 @@
       "version": "3.7.*",
       "nuget": [ "https://dotnet.myget.org/F/roslyn/api/v2/package" ],
       "vsix": [ "https://dotnet.myget.org/F/roslyn/vsix/upload" ],
-      "channels": [ "dev16.7", "dev16.7p3" ],
+      "channels": [ "dev16.7", "dev16.7p4" ],
       "vsBranch": "master",
       "vsMajorVersion": 16
     },
+    "release/dev16.8-preview1-vs-deps": {
+      "nugetKind": ["Shipping", "NonShipping"],
+      "version": "3.7.*",
+      "nuget": [ "https://dotnet.myget.org/F/roslyn/api/v2/package" ],
+      "vsix": [ "https://dotnet.myget.org/F/roslyn/vsix/upload" ],
+      "channels": [ "dev16.8", "dev16.8p1" ],
+      "vsBranch": null,
+      "vsMajorVersion": 16
+    },
     "features/NullableReferenceTypes": {
       "nugetKind": "PerBuildPreRelease",
       "version": "2.6.*",