build(rust): update base64 requirement from 0.13 to 0.21 (#6249)

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Stijn de Gooijer <stijn@degooijer.io>

polars/polars-core/Cargo.toml

@@ -157,7 +157,7 @@ docs-selection = [
 ahash.workspace = true
 anyhow.workspace = true
 arrow.workspace = true
-base64 = { version = "0.13", optional = true }
+base64 = { version = "0.21", optional = true }
 bitflags.workspace = true
 chrono = { version = "0.4", optional = true }
 chrono-tz = { version = "0.8", optional = true }

polars/polars-core/src/chunked_array/binary/encoding.rs

@@ -1,4 +1,6 @@
-use {base64, hex};
+use base64::engine::general_purpose;
+use base64::Engine as _;
+use hex;
 
 use crate::prelude::*;
 
@@ -19,14 +21,15 @@ impl BinaryChunked {
 
     pub fn base64_decode(&self) -> PolarsResult<BinaryChunked> {
         self.try_apply(|s| {
-            let bytes =
-                base64::decode(s).map_err(|e| PolarsError::ComputeError(e.to_string().into()))?;
+            let bytes = general_purpose::STANDARD
+                .decode(s)
+                .map_err(|e| PolarsError::ComputeError(e.to_string().into()))?;
             Ok(bytes.into())
         })
     }
 
     pub fn base64_encode(&self) -> Series {
-        self.apply(|s| base64::encode(s).into_bytes().into())
+        self.apply(|s| general_purpose::STANDARD.encode(s).into_bytes().into())
             .cast_unchecked(&DataType::Utf8)
             .unwrap()
     }

polars/polars-core/src/chunked_array/strings/encoding.rs

@@ -1,4 +1,6 @@
-use {base64, hex};
+use base64::engine::general_purpose;
+use base64::Engine as _;
+use hex;
 
 use crate::prelude::*;
 
@@ -34,6 +36,6 @@ impl Utf8Chunked {
 
     #[must_use]
     pub fn base64_encode(&self) -> Utf8Chunked {
-        self.apply(|s| base64::encode(s).into())
+        self.apply(|s| general_purpose::STANDARD.encode(s).into())
     }
 }