Update to bigdecimal 0.2 and num-bigint 0.3

Author: Julius de Bruijn

Cargo.lock

@@ -46,7 +46,7 @@ ahash = "0.5"
 atoi = "0.3.2"
 sqlx-rt = { path = "../sqlx-rt", version = "0.1.1" }
 base64 = { version = "0.13.0", default-features = false, optional = true, features = [ "std" ] }
-bigdecimal_ = { version = "0.1.0", optional = true, package = "bigdecimal" }
+bigdecimal_ = { version = "0.2.0", optional = true, package = "bigdecimal" }
 rust_decimal = { version = "1.7.0", optional = true }
 bit-vec = { version = "0.6.2", optional = true }
 bitflags = { version = "1.2.1", default-features = false }
@@ -73,7 +73,7 @@ libsqlite3-sys = { version = "0.20.1", optional = true, default-features = false
 log = { version = "0.4.8", default-features = false }
 md-5 = { version = "0.9.0", default-features = false, optional = true }
 memchr = { version = "2.3.3", default-features = false }
-num-bigint = { version = "0.2.0", default-features = false, optional = true, features = [ "std" ] }
+num-bigint = { version = "0.3.0", default-features = false, optional = true, features = [ "std" ] }
 once_cell = "1.4.0"
 percent-encoding = "2.1.0"
 parking_lot = "0.11.0"