[Security] Bump stringstream from 0.0.5 to 0.0.6 in /server

[dependabot-preview[bot]]

Bumps stringstream from 0.0.5 to 0.0.6. This update includes security fixes.

Vulnerabilities fixed

*Sourced from [The Node Security Working Group](https://github.com/nodejs/security-wg/blob/master/vuln/npm/422.json).* > **Out-of-bounds Read** > `stringstream` allocates uninitialized Buffers when number is passed in input stream on Node.js 4.x and below > > Affected versions: <=0.0.5 *Sourced from [The Node Security Working Group](https://github.com/nodejs/security-wg/blob/master/vuln/npm/422.json).* > **Out-of-bounds Read** > `stringstream` allocates uninitialized Buffers when number is passed in input stream on Node.js 4.x and below > > Affected versions: <=0.0.5

Commits

- [`fee31c5`](https://github.com/mhart/StringStream/commit/fee31c5c4a5efc7c7cc2fde4aee633dedefd6d67) 0.0.6 - [`2f4a9d4`](https://github.com/mhart/StringStream/commit/2f4a9d496f94b0880e01a26857aa266a5a3ef274) Merge pull request [#9](https://github-redirect.dependabot.com/mhart/StringStream/issues/9) from mhart/fix-buffer-constructor-vuln - [`afbc744`](https://github.com/mhart/StringStream/commit/afbc7442220358419e330618e47f3a65fc265b1b) Ensure data is not a number in Buffer constructor - See full diff in [compare view](https://github.com/mhart/StringStream/compare/v0.0.5...v0.0.6)

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[dependabot-preview[bot]]

Looks like stringstream is no longer a dependency, so this is no longer needed.