build(deps): update sigstore requirement from <3.7,>=3.5.3 to >=3.5.3,<4.1 in the python group

[dependabot]

Updates the requirements on sigstore to permit the latest version.
Updates sigstore to 4.0.0

Release notes

Sourced from sigstore's releases.

v4.0.0

This is a major release with a host of API and functionality changes. The major new feature is Rekor v2 support but many other changes are also included, see list below.

Added

• cli: Add --rekor-version to sign command arguments: This can be useful if Sigstore instance provides multiple Rekor versions and user wants to override the default choice #1471
• cli: Support parallel signing. When multiple artifacts are signed, the Rekor requests are submitted in parallel: this is especially useful with Rekor v2. #1468, #1478, #1485
• oidc (API): Allow custom audience claims via API #1402
• rekor (API): Support Rekor v2 (aka rekor-tiles) in both verification and signing. #1370, #1422, #1432
• trust (API): Make TrustedRoot, SigningConfig and ClientTrustConfig public API #1496

Changed

• cli: Improve verify UX when wrong instance is used #1510
• deps: replace sigstore_protobuf_specs dependency with sigstore-models #1470
• trust: Update embedded TUF root #1515
• trust (API): TrustConfig now provides the production()and staging() helpers. Similar methods were removed from SigningConfig, TrustedRoot, SigningContext and Issuer. Use TrustConfig everywhere in code base. #1363
• trust (API): support SigningConfig v0.2, remove support for v0.1. The new format now fully defines the sigstore instance the client uses. SigningConfig class now has methods to return actual clients (like RekorClient) instead of just URLs for that sigstore instance. The --trust-config cli option now expects the trust config to contain a v0.2 SigningConfig. #1358, #1407
• trust: Support ed25519 keys in trusted root #1377

Fixed

• rekor: resolve circular import of LogEntry #1458
• rekor: Fix checkpoint signature lookup when there are multiple signatures #1514
• rekor: Fix entry handling so inclusion promise is optional #1382

... (truncated)

Changelog

Sourced from sigstore's changelog.

[4.0.0]

This is a major release with a host of API and functionality changes. The major new feature is Rekor v2 support but many other changes are also included, see list below.

Added

• cli: Add --rekor-version to sign command arguments: This can be useful if Sigstore instance provides multiple Rekor versions and user wants to override the default choice #1471
• cli: Support parallel signing. When multiple artifacts are signed, the Rekor requests are submitted in parallel: this is especially useful with Rekor v2. #1468, #1478, #1485
• oidc (API): Allow custom audience claims via API #1402
• rekor (API): Support Rekor v2 (aka rekor-tiles) in both verification and signing. #1370, #1422, #1432
• trust (API): Make TrustedRoot, SigningConfig and ClientTrustConfig public API #1496

Changed

• cli: Improve verify UX when wrong instance is used #1510
• deps: replace sigstore_protobuf_specs dependency with sigstore-models #1470
• trust: Update embedded TUF root #1515
• trust (API): TrustConfig now provides the production()and staging() helpers. Similar methods were removed from SigningConfig, TrustedRoot, SigningContext and Issuer. Use TrustConfig everywhere in code base. #1363
• trust (API): support SigningConfig v0.2, remove support for v0.1. The new format now fully defines the sigstore instance the client uses. SigningConfig class now has methods to return actual clients (like RekorClient) instead of just URLs for that sigstore instance. The --trust-config cli option now expects the trust config to contain a v0.2 SigningConfig. #1358, #1407
• trust: Support ed25519 keys in trusted root #1377

Fixed

• rekor: resolve circular import of LogEntry #1458
• rekor: Fix checkpoint signature lookup when there are multiple signatures #1514
• rekor: Fix entry handling so inclusion promise is optional #1382

... (truncated)

Commits

• 7a9551f Prepare 4.0.0 release (#1541)
• 83feb3d build(deps): bump pyopenssl from 25.2.0 to 25.3.0 (#1543)
• 3b5632f build(deps): bump cryptography from 45.0.7 to 46.0.1 (#1544)
• 365af7b build(deps): bump pyopenssl from 25.1.0 to 25.2.0 (#1542)
• 5fac477 build(deps): update ruff requirement from <0.12.13 to <0.13.1 (#1539)
• 2265c11 build(deps): bump github/codeql-action in the actions group (#1540)
• ce00166 build(deps): bump github/codeql-action in the actions group (#1538)
• 6f7d34f build(deps): bump the actions group with 2 updates (#1537)
• 1630428 feat(models): expose TrustedRoot, SigningConfig, ClientTrustConfig (#1496)
• f3af0dd build(deps): bump github/codeql-action in the actions group (#1535)
• Additional commits viewable in compare view

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[jku]

this can be handled in #132 (see later comments)

[dependabot]

Looks like sigstore is no longer updatable, so this is no longer needed.