build(deps): bump tar and npm

[dependabot[bot]]

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Removes tar. It's no longer used after updating ancestor dependency npm. These dependencies need to be updated together.

Removes tar

Updates npm from 7.16.0 to 7.20.6

Changelog

Sourced from npm's changelog.

v7.20.6 (2021-08-12)

DEPENDENCIES

• 5bebf280f [email protected]
  • fix: reserve paths case-insensitively
• 5d89de44d [email protected]:
  • fix: normalize paths on Windows systems
• a1bdbea97 #3569
  • remove byte-size (@​wraithgar)
• 61782fa85 @npmcli/[email protected]:
  • fix: better error message for duplicate workspace names
• b88f770fa @npmcli/[email protected]:
  • #3632 Fix "cannot read property path of null" error in 'npm dedupe'
  • fix(shrinkwrap): always set name on the root node

DOCUMENTATION

• 001f2c1b7 #3621 fix(docs): do not include certain files (@​AkiJoey)
• d1812f1a6 #3630 fix(docs): update npm-publish access flag info (@​austincho)
• d5a099c7b #3615 fix(readme): add nvm-windows to installers links (@​Yash-Singh1)

v7.20.5 (2021-08-05)

DEPENDENCIES

• 44377738e [email protected]
  • fix: start retrying immediately, stop after 60 seconds

v7.20.4 (2021-08-05)

BUG FIXES

... (truncated)

Commits

• 59b9851 7.20.6
• 2591e67 update AUTHORS
• f7905cc docs: changelog for v7.20.6
• d465ef6 chore(smoke-tests): rebuild snapshots
• b88f770 @​npmcli/arborist@​2.8.1
• 5bebf28 [email protected]
• 47a3d18 fix(package): add map-workspaces to bundleDependencies
• d5a099c fix(readme): add nvm-windows to installers links
• 61782fa @​npmcli/map-workspaces@​1.0.4
• a1bdbea deps: remove byte-size
• Additional commits viewable in compare view

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