Update dependency python-hcl2 to v7

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
python-hcl2	6.1.1 -> 7.0.0

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Release Notes

amplify-education/python-hcl2 (python-hcl2)

v7.0.0

Compare Source

Added

• Limitations section to README.md (#​200)

Fixed

• Issue handling heredoc with delimiter within text itself (#​194)
• Various issues with parsing object elements (#​197)
• Dictionary -> hcl2 reconstruction of null values (#​198)
• Inaccurate parsing of null values in some cases (#​206)
• Missing parenthesis in arithemetic expressions (#​194)
• Noticeable overhead when loading hcl2.reconstructor module (#​202)
• Escaped string interpolation (e.g. "$${aws:username}") parsing (#​200)

Removed

• Support for parsing interpolations nested more than 2 times (known-issue) (#​200)

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