remove java.io.Serializable interface from SQLServerConnectionPoolProxy.

[xiangyushawn]

for issue #190

[codecov-io]

Codecov Report

Merging #201 into dev will decrease coverage by <.01%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##                dev     #201      +/-   ##
============================================
- Coverage     32.83%   32.83%   -0.01%     
- Complexity     1428     1430       +2     
============================================
  Files            97       97              
  Lines         23359    23359              
  Branches       3881     3881              
============================================
- Hits           7670     7669       -1     
- Misses        14148    14152       +4     
+ Partials       1541     1538       -3

Flag	Coverage Δ	Complexity Δ
#JDBC41	32.73% <ø> (ø)	1425 <ø> (+1)	✅
#JDBC42	32.78% <ø> (+0.01%)	1430 <ø> (+4)	✅

Impacted Files	Coverage Δ	Complexity Δ
...t/sqlserver/jdbc/SQLServerConnectionPoolProxy.java	12.62% <ø> (ø)	12 <0> (ø)	❌
...rc/main/java/com/microsoft/sqlserver/jdbc/DDC.java	24.55% <0%> (-0.45%)	39% <0%> (ø)
...om/microsoft/sqlserver/jdbc/SQLServerBulkCopy.java	44.94% <0%> (-0.08%)	181% <0%> (-1%)
...in/java/com/microsoft/sqlserver/jdbc/IOBuffer.java	36.34% <0%> (-0.07%)	0% <0%> (ø)
...m/microsoft/sqlserver/jdbc/SQLServerResultSet.java	23.92% <0%> (+0.08%)	171% <0%> (+1%)	✅
src/main/java/microsoft/sql/DateTimeOffset.java	40% <0%> (+2.85%)	10% <0%> (+2%)	✅

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