Remove version pin in devcontainer

[RobRoseKnows]

The version pin in the devcontainer means that pixlet create and pixlet check are unavailable. I removed the pinned version so that by default we install the latest pixlet.

[tidbyt]

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Next Steps

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Manual Review Required

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	Test	Details
🟡	App Dir	File '.devcontainer/install_pixlet.sh' is not below apps/
✅	Modules	No .star files modified
🟡	Original Author	The original author (joshspicer) does not match the PR author (RobRoseKnows)

[tidbyt-bot]

CLA Assistant Lite bot All contributors have signed the CLA ✍️ ✅

[RobRoseKnows]

I have read the CLA Document and I hereby sign the CLA