use ubuntu 22 for link check (#10058)

### Motivation and Context

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Changed the runner image to explicitly 22.04 ubuntu because 24.04
doesn't work for link inspect.

Also updated one chroma link

### Description

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### Contribution Checklist

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- [x] The code builds clean without any errors or warnings
- [x] The PR follows the [SK Contribution
Guidelines](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md)
and the [pre-submission formatting
script](https://github.com/microsoft/semantic-kernel/blob/main/CONTRIBUTING.md#development-scripts)
raises no violations
- [x] All unit tests pass, and I have added new tests where possible
- [x] I didn't break anyone 😄

.github/workflows/markdown-link-check.yml

@@ -10,7 +10,7 @@ permissions:
 
 jobs:
   markdown-link-check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-22.04
     # check out the latest version of the code
     steps:
       - uses: actions/checkout@v4

dotnet/src/Connectors/Connectors.Memory.Chroma/README.md

@@ -1,6 +1,6 @@
 # Microsoft.SemanticKernel.Connectors.Chroma
 
-This assembly contains implementation of Semantic Kernel Memory Store using [Chroma](https://docs.trychroma.com/), open-source embedding database.
+This assembly contains implementation of Semantic Kernel Memory Store using [Chroma](https://www.trychroma.com/), open-source embedding database.
 
 **Note:** Chroma connector is verified using Chroma version **0.4.10**. Any higher versions may introduce incompatibility.