FIX: Pin Alpine ARM64 to 3.22 to fix msodbcsql arch mismatch issue (#366)

### Work Item / Issue Reference  
<!-- 
IMPORTANT: Please follow the PR template guidelines below.
For mssql-python maintainers: Insert your ADO Work Item ID below (e.g.
AB#37452)
For external contributors: Insert Github Issue number below (e.g. #149)
Only one reference is required - either GitHub issue OR ADO Work Item.
-->

<!-- mssql-python maintainers: ADO Work Item -->
>
[AB#40903](https://sqlclientdrivers.visualstudio.com/c6d89619-62de-46a0-8b46-70b92a84d85e/_workitems/edit/40903)

<!-- External contributors: GitHub Issue -->
> GitHub Issue: #<ISSUE_NUMBER>

-------------------------------------------------------------------
### Summary   
<!-- Insert your summary of changes below. Minimum 10 characters
required. -->

1.  ARM64 ODBC Package Issue:
• The ARM64 ODBC driver package (msodbcsql18_18.5.1.1-1_arm64.apk)
contains arch = x86_64 in .PKGINFO.
• This is causing installation failures on newer Alpine versions where
architecture validation is enforced.
• Local Docker testing confirmed that Alpine 3.22 installs the package
successfully.

2. Compiler Warning Issue on Alpine:
• The CI also fails with alpine :latest due to a new compiler warning in
std::wstring_convert (_GLIBCXX17_DEPRECATED) which is treated as an
error.
• The current fix for this warning relies on Alpine 3.22, so we have
pinned x86_64 CI to 3.22 too for now.

3. Temporary CI Fix:
	• Both ARM64 and x86_64 CI jobs are now pinned to Alpine 3.22.
• This unblocks all pipelines while maintaining consistency across
architectures.

4. We'll track ODBC team’s fix for ARM64 package and once fixed, we can
safely move Alpine CI back to alpine:latest. Also, we have a proper fix
for the compiler warning to allow CI to eventually move back to latest.

<!-- 
### PR Title Guide

> For feature requests
FEAT: (short-description)

> For non-feature requests like test case updates, config updates ,
dependency updates etc
CHORE: (short-description) 

> For Fix requests
FIX: (short-description)

> For doc update requests 
DOC: (short-description)

> For Formatting, indentation, or styling update
STYLE: (short-description)

> For Refactor, without any feature changes
REFACTOR: (short-description)

> For release related changes, without any feature changes
RELEASE: #<RELEASE_VERSION> (short-description) 

### Contribution Guidelines

External contributors:
- Create a GitHub issue first:
https://github.com/microsoft/mssql-python/issues/new
- Link the GitHub issue in the "GitHub Issue" section above
- Follow the PR title format and provide a meaningful summary

mssql-python maintainers:
- Create an ADO Work Item following internal processes
- Link the ADO Work Item in the "ADO Work Item" section above  
- Follow the PR title format and provide a meaningful summary
-->

Author: gargsaumya

eng/pipelines/pr-validation-pipeline.yml

@@ -1395,12 +1395,14 @@ jobs:
 
   - script: |
       # Create a Docker container for testing on x86_64
+      # TODO(AB#40901): Temporary pin to 3.22 due to msodbcsql ARM64 package arch mismatch
+      # Revert to alpine:latest once ODBC team releases fixed ARM64 package
       docker run -d --name test-container-alpine \
         --platform linux/amd64 \
         -v $(Build.SourcesDirectory):/workspace \
         -w /workspace \
         --network bridge \
-        alpine:latest \
+        alpine:3.22 \
         tail -f /dev/null
     displayName: 'Create Alpine x86_64 container'
 
@@ -1637,12 +1639,14 @@ jobs:
 
   - script: |
       # Create a Docker container for testing on ARM64
+      # TODO(AB#40901): Temporary pin to 3.22 due to msodbcsql ARM64 package arch mismatch
+      # Revert to alpine:latest once ODBC team releases fixed ARM64 package
       docker run -d --name test-container-alpine-arm64 \
         --platform linux/arm64 \
         -v $(Build.SourcesDirectory):/workspace \
         -w /workspace \
         --network bridge \
-        alpine:latest \
+        alpine:3.22 \
         tail -f /dev/null
     displayName: 'Create Alpine ARM64 container'