[OOB] Upgrades 'dotnet-core' to '4.2.3'

[SvcGitHubPATagentoperatorimages]

Automated OOB update requested by SvcGitHubPATagentoperatorimages.

Agent: dotnet-core
Version: 4.2.2 -> 4.2.3

[github-actions]

Images built:

dotnet-core: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-core@sha256:324ad03a7f3b0a64fa208b6a2171123d73546baf70ff3e890c0962bccde62f04
dotnet-framework: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-framework@sha256:1cfb23b134b16ea2c4603f790176f3bbf27dfeac5be1aafc1458f080aafc90bf
java: ghcr.io/contrast-security-oss/agent-operator-images/agent-java@sha256:23b692e4cc02fe0fbb115ec83799cab735484cc5453d340c8619529edaffc5fc
nodejs: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs@sha256:41268d48802ba7ba9d4dffe6d21049ddcca6b42d9e64c020056b0ab6aced642b
nodejs-protect: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs-protect@sha256:0d614a4aabc7cdc3b1eca17031ca4c6ab0a70b10e0f69bffb6594f9bad10f916
php: ghcr.io/contrast-security-oss/agent-operator-images/agent-php@sha256:42b71fb604e9dd99911e9ebbd7b502a6277e54c69b37492364c532a52a03d573