build: update yarn to v4.5.1

[HowardBraham]

Description

Updates yarn to the latest v4.5.1, and adjusts LavaMoat policies to accommodate.

[github-actions]

CLA Signature Action: All authors have signed the CLA. You may need to manually re-run the blocking PR check if it doesn't pass in a few minutes.

[metamaskbot]

Builds ready [c238f74]

• builds: chrome, firefox
• builds (beta): chrome
• builds (flask): chrome, firefox
• builds (MMI): chrome, firefox
• builds (test): chrome, firefox
• builds (test-flask): chrome, firefox
• build viz: Build System
• mv3: Background Module Init Stats
• mv3: UI Init Stats
• mv3: Module Load Stats
• mv3: Bundle Size Stats
• mv2: E2e Actions Stats
• code coverage: Report
• storybook: Storybook
• typescript migration: Dashboard
• all artifacts
• bundle viz:

  • background: 0, 1, 2, 3, 4, 5, 6, 7
  • common: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9
  • content-script: 0
  • offscreen: 0
  • ui: 0, 1, 10, 11, 12, 2, 3, 4, 5, 6, 7, 8, 9

Page Load Metrics (1841 ± 88 ms)

Platform	Page	Metric	Min (ms)	Max (ms)	Average (ms)	StandardDeviation (ms)	MarginOfError (ms)
Chrome	Home	firstPaint	365	2420	1769	367	176
		domContentLoaded	1597	2405	1806	175	84
		load	1611	2421	1841	183	88
		domInteractive	25	190	51	37	18
		backgroundConnect	7	107	36	30	14
		firstReactRender	49	291	101	54	26
		getState	4	92	19	23	11
		initialActions	0	44	2	10	5
		loadScripts	1145	1939	1322	162	78
		setupStore	6	88	20	23	11
		uiStartup	1814	2641	2083	246	118

Bundle size diffs

• background: 0 Bytes (0.00%)
• ui: 0 Bytes (0.00%)
• common: 0 Bytes (0.00%)

[Gudahtt]

LGTM!

The policy change suggests that Yarn updated its algorithm for when to hoist packages in node_modules. I see a couple of entries in their changelog related to this, so that makes sense. Not sure specifically which change caused this.