[OOB] Upgrades 'dotnet-core' to '4.2.13'

[SvcGitHubPATagentoperatorimages]

Automated OOB update requested by SvcGitHubPATagentoperatorimages.

Agent: dotnet-core
Version: 4.2.12 -> 4.2.13

[github-actions]

Images built:

dotnet-core: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-core@sha256:6a0bbdd61593b59bebbed9091eb0479814bc3aeff7c5669744a0a9eac8327d73
dotnet-framework: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-framework@sha256:4cb65570a95ca1b53de2416b7e8a18a22c63a04be3918bc0b0b464f8655937da
java: ghcr.io/contrast-security-oss/agent-operator-images/agent-java@sha256:c74cad3645c4d5dfc15ace149f3797c5f9fb6433c68feb4eca98a91098f76d0c
nodejs: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs@sha256:d79e12572049725f8f35d00c05080e7907a2c0c7663c2a96144c5ad9cf38a5bb
php: ghcr.io/contrast-security-oss/agent-operator-images/agent-php@sha256:c19f39161d45e89d2417856a61db4f5f832c73129039818138f83b255b4b8b64
python: ghcr.io/contrast-security-oss/agent-operator-images/agent-python@sha256:327b5e8ec5d09f1f9ed5a9c184663b95798ac5f7fde94a246d6772df300d2041