chore(deps): update module github.com/letsencrypt/boulder to v0.20260602.0 (9.3)

[elastic-renovate-prod]

This PR contains the following updates:

Package	Type	Update	Change
github.com/letsencrypt/boulder	indirect	minor	v0.20260526.0 -> v0.20260602.0

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Release Notes

letsencrypt/boulder (github.com/letsencrypt/boulder)

v0.20260602.0

Compare Source

What's Changed

• Expose retry-after in CORS Access-Control-Expose-Headers by @​mcpherrinm in https://github.com/letsencrypt/boulder/pull/8758
• ci: remediate zizmor finding by @​inahga in https://github.com/letsencrypt/boulder/pull/8768
• mtca: add generator for test CA by @​jsha in https://github.com/letsencrypt/boulder/pull/8765
• Ceremony: require configs to specify a profile URL by @​aarongable in https://github.com/letsencrypt/boulder/pull/8770
• sa: add schema for MTC operations by @​jsha in https://github.com/letsencrypt/boulder/pull/8764

Full Changelog: letsencrypt/boulder@v0.20260526.0...v0.20260602.0

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