build(deps): update oci-spec requirement from 0.6.6 to 0.7.0

[dependabot[bot]]

Updates the requirements on oci-spec to permit the latest version.

Release notes

Sourced from oci-spec's releases.

v0.7.0

What's Changed

Runtime Specification

• Add features structure type by @​musaprg in containers/oci-spec-rs#184
• Add Builder for features structures by @​musaprg in containers/oci-spec-rs#199
• Remove once_cell dependency by @​keisku in containers/oci-spec-rs#194
• Change the type of size to be u64 by @​cgwalters in containers/oci-spec-rs#203
• Add Digest and SHA256Digest by @​cgwalters in containers/oci-spec-rs#202
• Update description of cpu_affinity_final by @​keisku in containers/oci-spec-rs#192

Test improvements and Misc Fixes

• Fix invalid format of comments by @​musaprg in containers/oci-spec-rs#195
• MediaType: Add an AsRef<str> conversion by @​cgwalters in containers/oci-spec-rs#200
• digest: Minor self-review fixups by @​cgwalters in containers/oci-spec-rs#206
• Import reference by @​cgwalters in containers/oci-spec-rs#207
• Enable cargo audit by @​flavio in containers/oci-spec-rs#208
• reference: use thiserror by @​cgwalters in containers/oci-spec-rs#213
• Rework Digest by @​cgwalters in containers/oci-spec-rs#212
• Fix clippy false positive by @​saschagrunert in containers/oci-spec-rs#215
• Update and pin GitHub actions by @​saschagrunert in containers/oci-spec-rs#216
• Run clippy with nightly toolchain by @​saschagrunert in containers/oci-spec-rs#217

New Contributors

• @​musaprg made their first contribution in containers/oci-spec-rs#195
• @​flavio made their first contribution in containers/oci-spec-rs#208

Full Changelog: https://github.com/containers/oci-spec-rs/compare/v0.6.8...v0.7.0

Commits

• 4c34498 Bump to 0.7.0
• 2b9ff93 Merge pull request #217 from saschagrunert/clippy-nightly
• 37b1b56 Run clippy with nightly toolchain
• 48af64d Merge pull request #216 from saschagrunert/actions
• 6cbebf8 Merge pull request #215 from saschagrunert/clippy
• 7f7725c Update and pin GitHub actions
• 4a76ed1 Fix clippy false positive
• fa8a533 Merge pull request #212 from cgwalters/digest-rework
• 8e70541 Merge pull request #213 from cgwalters/reference-thiserror
• 900783b reference: use thiserror
• Additional commits viewable in compare view

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[zvonkok]

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