Bug when creating a branch for a non-initial release for a monorepo with independent versions

[mcmire]

If you attempt to use create-release-branch after having used it already to release an monorepo with independent versions, you will get:

➤  ts-node ../../metamask/create-release-branch/src/cli.ts
Project appears to have workspaces. Following monorepo workflow.
Release spec already exists. Picking back up from previous run.
AssertionError [ERR_ASSERTION]: Most recent tag should start with v
    at getMostRecentTag (/Users/<username>/code/metamask/create-release-branch/node_modules/@metamask/auto-changelog/src/update-changelog.ts:19:10)
    at processTicksAndRejections (internal/process/task_queues.js:95:5)
    at async updateChangelog (/Users/<username>/code/metamask/create-release-branch/node_modules/@metamask/auto-changelog/src/update-changelog.ts:149:25)
    at async updatePackageChangelog (/Users/<username>/code/metamask/create-release-branch/src/package.ts:268:31)
    at async updatePackage (/Users/<username>/code/metamask/create-release-branch/src/package.ts:318:5)
    at async /Users/<username>/code/metamask/create-release-branch/src/release-plan.ts:128:7
    at async Promise.all (index 1)
    at async executeReleasePlan (/Users/<username>/code/metamask/create-release-branch/src/release-plan.ts:123:3)
    at async followMonorepoWorkflow (/Users/<username>/code/metamask/create-release-branch/src/monorepo-workflow-operations.ts:117:3)
    at async main (/Users/<username>/code/metamask/create-release-branch/src/main.ts:35:5) {
  generatedMessage: false,
  code: 'ERR_ASSERTION',
  actual: '@',
  expected: 'v',
  operator: 'strictEqual'
}

See: MetaMask/auto-changelog#116