build(deps): update der requirement from 0.6.1 to 0.7.6

[dependabot[bot]]

Updates the requirements on der to permit the latest version.

Commits

• 3b92283 der v0.7.6 (#1070)
• d84599e chore(deps): bump ciborium from 0.2.0 to 0.2.1 (#1069)
• 1024bea chore(deps): bump syn from 2.0.15 to 2.0.16 (#1068)
• 8f480f5 der: add SetOf(Vec)::insert(_ordered); deprecate add (#1067)
• 57b6ca5 der: fix handling of non-unique items in SetOf(Vec) (#1066)
• b0be47a der: add SetOfVec::{extend, from_iter} (#1065)
• 16aaafe pkcs7 v0.4.1 (#1063)
• 613940b pkcs7: deprecate in favor of cms (#1062)
• bb6bb25 x509-cert: 0.2.2-pre.1 (#1059)
• 8903335 x509-cert: consume the SignatureBitStringEncoding trait (#1048)
• Additional commits viewable in compare view

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[rjzak]

@dependabot rebase

[dependabot[bot]]

Looks like der is up-to-date now, so this is no longer needed.