CSPL-4238: Upgrade golang.org/x/crypto from 0.39.0 to 0.43.0

[rlieberman-splunk]

Description

Upgrade golang.org/x/crypto from 0.39.0 to 0.43.0 to fix a security vulnerability.

CVE | CVE-2025-47913
Severity | SEC_HIGH
Dependency | golang.org/x/crypto

Key Changes

• Update golang.org/x/crypto version in go.mod and go.sum

Testing and Verification

• Smoke and integration tests all pass: https://github.com/splunk/splunk-operator/actions/runs/19470156757

Related Issues

• https://splunk.atlassian.net/browse/CSPL-4238
• https://splunk.atlassian.net/browse/VULN-53388

PR Checklist

• Code changes adhere to the project's coding standards.
• Relevant unit and integration tests are included.
• Documentation has been updated accordingly.
• All tests pass locally.
• The PR description follows the project's guidelines.

[coveralls]

Pull Request Test Coverage Report for Build 19479486776

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.008%) to 86.544%

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Totals
Change from base Build 19427516711:	0.008%
Covered Lines:	10709
Relevant Lines:	12374

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 19479486810

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.008%) to 86.544%

---

Totals
Change from base Build 19427516711:	0.008%
Covered Lines:	10709
Relevant Lines:	12374

---

💛 - Coveralls

[gabrielm-splunk]

LGTM