[OOB] Upgrades 'dotnet-core' to '4.3.8'

[SvcGitHubPATagentoperatorimages]

Automated OOB update requested by SvcGitHubPATagentoperatorimages.

Agent: dotnet-core
Version: 4.3.7 -> 4.3.8

[github-actions]

Images built:

dotnet-core: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-core@sha256:4c0b8eb7f9f37578ed962db788482ec773a92194fa5e65a27fa17757ee4428ef
dotnet-framework: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-framework@sha256:a6b60d628fe1d49fae37c53122607342043b453108aa03d72186eb72781bf8a0
java: ghcr.io/contrast-security-oss/agent-operator-images/agent-java@sha256:9b754d1fd335148a67900b93f73db06aa2db2a9f0e696f8f8e7334fd392467a6
nodejs: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs@sha256:5549736ad282a6c5c2d2f2e6e8c8088ba5d890cbea8e587f446996138e23a84e
php: ghcr.io/contrast-security-oss/agent-operator-images/agent-php@sha256:8ffcb8d5d7969bc3fc1ba2bdbc5b851006982d30ec73e13efaaad497e60a46fc
python: ghcr.io/contrast-security-oss/agent-operator-images/agent-python@sha256:749eed35c3a7be78e4d7e1fbe9dad901bc6701e9f2a1489020e4e795754c25c0