fix: revert camelcase-keys to v7

[dhmlau]

In the latest version of @loopback/cli, it uses camelcase-keys@10 which is pure ESM. It causes TypeError as below when running lb4 command.

% lb4 app
/Users/SOMEPATH/@loopback/cli/lib/cli.js:39
  const options = camelCaseKeys(opts, {exclude: ['--', /^\w$/, 'argv']});
                  ^

TypeError: camelCaseKeys is not a function
   ....
    at Module._compile (node:internal/modules/cjs/loader:1521:14)
    at Module._extensions..js (node:internal/modules/cjs/loader:1623:10)
    at Module.load (node:internal/modules/cjs/loader:1266:32)
    at Module._load (node:internal/modules/cjs/loader:1091:12)
    at Function.executeUserEntryPoint [as runMain] (node:internal/modules/run_main:164:12)
    at node:internal/main/run_main_module:28:49

This PR reverts the camelcase-keys version to 7.x.

Checklist

• DCO (Developer Certificate of Origin) signed in all commits
• npm test passes on your machine
• New tests added or existing tests modified to cover all changes
• Code conforms with the style guide
• API Documentation in code was updated
• Documentation in /docs/site was updated
• Affected artifact templates in packages/cli were updated
• Affected example projects in examples/* were updated

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[coveralls]

Pull Request Test Coverage Report for Build 21143521178

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage remained the same at 54.896%

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Totals
Change from base Build 21124709533:	0.0%
Covered Lines:	9572
Relevant Lines:	12457

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💛 - Coveralls