JDK 8 compatibility fix for vector datatype handling

[muskan124947]

Description

After adding Vector datatype support #2634, we observed failures on JDK 8 due to a NoSuchMethodError when invoking ByteBuffer.position(int).

Root Cause

• In JDK 8, Buffer.position(int) returns Buffer.
• In JDK 9+, ByteBuffer overrides this method to return ByteBuffer.

Directly calling ByteBuffer.position(int) caused incompatibility and resulted in NoSuchMethodError on JDK 8.

Fix

Cast the ByteBuffer instance to Buffer before calling position().
This ensures consistent behavior across JDK 8 and newer versions.

Testing

• Verified all vector-related tests locally.
• Confirmed successful execution on JDK 8 as well as later JDK versions.

[codecov]

Codecov Report

❌ Patch coverage is 0% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 51.53%. Comparing base (e1acc9e) to head (952f61d).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
...java/com/microsoft/sqlserver/jdbc/VectorUtils.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##               main    #2750      +/-   ##
============================================
+ Coverage     51.51%   51.53%   +0.01%     
+ Complexity     4081     4078       -3     
============================================
  Files           149      149              
  Lines         34268    34268              
  Branches       5725     5725              
============================================
+ Hits          17654    17659       +5     
+ Misses        14125    14119       -6     
- Partials       2489     2490       +1     

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