Use node.js v16.8.0 for CI

[evantahler]

The latest version of Node.js has a bug when running jest. For now, we'll lock CI to use v16.8.0 rather than the latest, v16.9.0.

Re: nodejs/node#40030

Prevents cool looking bugs like:

#
# Fatal error in , line 0
# Check failed: !holder_map.has_named_interceptor().
#
#
#
#FailureMessage Object: 0x7ffef0ac0510
 1: 0xb691f1  [/usr/local/bin/node]
 2: 0x1bf3094 V8_Fatal(char const*, ...) [/usr/local/bin/node]
 3: 0x10ac4a1 v8::internal::ConcurrentLookupIterator::TryGetPropertyCell(v8::internal::Isolate*, v8::internal::LocalIsolate*, v8::internal::Handle<v8::internal::JSGlobalObject>, v8::internal::Handle<v8::internal::Name>) [/usr/local/bin/node]
 4: 0x1c5aa55  [/usr/local/bin/node]
 5: 0x1c5b9eb v8::internal::compiler::JSGlobalObjectRef::GetPropertyCell(v8::internal::compiler::NameRef const&, v8::internal::compiler::SerializationPolicy) const [/usr/local/bin/node]
 6: 0x1e61ba3 v8::internal::compiler::JSNativeContextSpecialization::ReduceNamedAccess(v8::internal::compiler::Node*, v8::internal::compiler::Node*, v8::internal::compiler::NamedAccessFeedback const&, v8::internal::compiler::AccessMode, v8::internal::compiler::Node*) [/usr/local/bin/node]
 7: 0x1e623c4 v8::internal::compiler::JSNativeContextSpecialization::ReducePropertyAccess(v8::internal::compiler::Node*, v8::internal::compiler::Node*, v8::base::Optional<v8::internal::compiler::NameRef>, v8::internal::compiler::Node*, v8::internal::compiler::FeedbackSource const&, v8::internal::compiler::AccessMode) [/usr/local/bin/node]
 8: 0x1e62f0c v8::internal::compiler::JSNativeContextSpecialization::ReduceJSLoadProperty(v8::internal::compiler::Node*) [/usr/local/bin/node]
 9: 0x1df5e0a v8::internal::compiler::Reducer::Reduce(v8::internal::compiler::Node*, v8::internal::compiler::ObserveNodeManager*) [/usr/local/bin/node]
10: 0x1c92604  [/usr/local/bin/node]
11: 0x1df60be v8::internal::compiler::GraphReducer::Reduce(v8::internal::compiler::Node*) [/usr/local/bin/node]
12: 0x1df7895 v8::internal::compiler::GraphReducer::ReduceTop() [/usr/local/bin/node]
13: 0x1df7c48 v8::internal::compiler::GraphReducer::ReduceNode(v8::internal::compiler::Node*) [/usr/local/bin/node]
14: 0x1ca03fd v8::internal::compiler::InliningPhase::Run(v8::internal::compiler::PipelineData*, v8::internal::Zone*) [/usr/local/bin/node]
15: 0x1ca1291 v8::internal::compiler::PipelineImpl::CreateGraph() [/usr/local/bin/node]
16: 0x1ca1668 v8::internal::compiler::PipelineCompilationJob::PrepareJobImpl(v8::internal::Isolate*) [/usr/local/bin/node]
17: 0xd94f5d v8::internal::OptimizedCompilationJob::PrepareJob(v8::internal::Isolate*) [/usr/local/bin/node]
18: 0xd96358  [/usr/local/bin/node]
19: 0xd97e70 v8::internal::Compiler::CompileOptimized(v8::internal::Isolate*, v8::internal::Handle<v8::internal::JSFunction>, v8::internal::ConcurrencyMode, v8::internal::CodeKind) [/usr/local/bin/node]
20: 0x11f4463 v8::internal::Runtime_CompileOptimized_Concurrent(int, unsigned long*, v8::internal::Isolate*) [/usr/local/bin/node]
21: 0x15e67f9  [/usr/local/bin/node]