Update circuits to Orchard 0.14 and halo2_gadgets 0.5

[ValarDragon]

Summary

• bump voting-circuits to 0.8.0
• update orchard to 0.14 and halo2_gadgets to =0.5.0
• use CircuitVersion::AnchoredBase for ECC chip construction
• consume imt-tree 0.2.0 from crates.io
• update dependency docs, changelog, and lockfile

Published dependencies

• imt-tree 0.2.0

Tests

• cargo check --all-targets

[socket-security]

Review the following changes in direct dependencies. Learn more about Socket for GitHub.

Diff	Package	Supply Chain Security	Vulnerability	Quality	Maintenance	License
	halo2_gadgets@​0.4.0 ⏵ 0.5.0
	orchard@​0.13.1 ⏵ 0.14.0

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