fix: add replace directive for vendoring case sensitivity

Add replace directive in go.mod to ensure consistent lowercase module path
for vendoring compatibility on case-sensitive filesystems (Linux).

Fixes #234

Author: dlevy-msft-sql

go.mod

@@ -37,3 +37,9 @@ require (
 	golang.org/x/net v0.47.0 // indirect
 	gopkg.in/yaml.v3 v3.0.1 // indirect
 )
+
+// Ensure canonical lowercase module path for vendoring compatibility.
+// This prevents issues on case-sensitive filesystems (Linux) where vendoring
+// might create directories with inconsistent casing.
+// See: https://github.com/golang/go/issues/38342
+replace github.com/Microsoft/go-mssqldb => ./