[OOB] Upgrades 'dotnet-core' to '4.2.12'

[SvcGitHubPATagentoperatorimages]

Automated OOB update requested by SvcGitHubPATagentoperatorimages.

Agent: dotnet-core
Version: 4.2.11 -> 4.2.12

[github-actions]

Images built:

dotnet-core: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-core@sha256:31c9a1a07c851c91cb6b4befb88fe318c776b78869b4a95bdfcdd6e65e9e45ea
dotnet-framework: ghcr.io/contrast-security-oss/agent-operator-images/agent-dotnet-framework@sha256:f4f6f06924a69bf48ce13824d86d9961dadf8398fb3507556e73cdc247eebf18
java: ghcr.io/contrast-security-oss/agent-operator-images/agent-java@sha256:38fe9b6aa54fc31f9631ce0bdcc7b1b68ec4b98989dc5b3e08baf8bf4562cfcb
nodejs: ghcr.io/contrast-security-oss/agent-operator-images/agent-nodejs@sha256:427b332c739f7f3b8a464e3df46127643bf4f3734cb1cef1fb2f3a63de4cef29
php: ghcr.io/contrast-security-oss/agent-operator-images/agent-php@sha256:d4d3aced3a3526b43dfc8f5537ce7afa0cd754388fac0b5ac3fce6150b69730d
python: ghcr.io/contrast-security-oss/agent-operator-images/agent-python@sha256:c97748f44ee26996b50b90374a3dae70efab212c55887cf068e7e8ac4d53e7e2