feat(core): update TS target to ES2021

[JamesHenry]

Current Behavior

We downlevel async await and likely a few other things to work based on the ES2015 target, but our minimum supported Node version is Node 16, which fully supports ES2021.

Expected Behavior

We output async await and other such things unmodified.

Related Issue(s)

Fixes #

[vercel]

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Name	Status	Preview	Comments	Updated (UTC)
nx-dev	✅ Ready (Inspect)	Visit Preview	💬 Add feedback	Aug 31, 2023 5:48pm

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✅ Successfully ran 8 targets

• nx affected --target=e2e --base=fef332e5374a7b5c7343d62f2f76b6194dd9fa9e --head=68df1a576282b7cbf1e0236276b0d03839cacf89 --parallel=1
• nx affected --target=test --base=fef332e5374a7b5c7343d62f2f76b6194dd9fa9e --head=68df1a576282b7cbf1e0236276b0d03839cacf89 --parallel=1
• nx affected --target=build --base=fef332e5374a7b5c7343d62f2f76b6194dd9fa9e --head=68df1a576282b7cbf1e0236276b0d03839cacf89 --parallel=3
• nx affected --target=lint --base=fef332e5374a7b5c7343d62f2f76b6194dd9fa9e --head=68df1a576282b7cbf1e0236276b0d03839cacf89 --parallel=3
• nx run-many -t check-imports check-commit check-lock-files check-codeowners documentation --parallel=1 --no-dte
• nx-cloud record -- nx format:check --base=fef332e5374a7b5c7343d62f2f76b6194dd9fa9e --head=68df1a576282b7cbf1e0236276b0d03839cacf89
• nx documentation --no-dte
• nx affected -t e2e-macos --parallel=1 --base=fef332e5374a7b5c7343d62f2f76b6194dd9fa9e --head=68df1a576282b7cbf1e0236276b0d03839cacf89

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[github-actions]

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