Backport of Upgrade hcl to fix crash with optional attributes into v1.3 #31855
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Backport
This PR is auto-generated from #31847 to be assessed for backporting due to the inclusion of the label 1.3-backport.
The below text is copied from the body of the original PR.
Include the changes to HCL proposed in hashicorp/hcl#555. Includes a context test which crashes before this HCL upgrade.
Fixes #31844
Target Release
1.3.1
Draft CHANGELOG entry
BUG FIXES