Update auth to 2.20.15 (#2772)

Updates software.amazon.awssdk:auth from 2.17.295 to 2.20.15.


I'll automatically update this PR to resolve conflicts as long as you
don't change it yourself.

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Configure Scala Steward for your repository with a
[`.scala-steward.conf`](https://github.com/scala-steward-org/scala-steward/blob/f12a86103f9f59b59628405e2b8648d9643706bc/docs/repo-specific-configuration.md)
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<details>
<summary>Adjust future updates</summary>

Add this to your `.scala-steward.conf` file to ignore future updates of
this dependency:
```
updates.ignore = [ { groupId = "software.amazon.awssdk", artifactId = "auth" } ]
```
Or, add this to slow down future updates of this dependency:
```
dependencyOverrides = [{
  pullRequests = { frequency = "30 days" },
  dependency = { groupId = "software.amazon.awssdk", artifactId = "auth" }
}]
```
</details>

labels: library-update

Co-authored-by: Taro L. Saito <[email protected]>

build.sbt

@@ -870,7 +870,7 @@ lazy val parquet =
         "org.apache.hadoop"  % "hadoop-client"  % "3.3.5" % Provided,
         // For S3 support
         "org.apache.hadoop"      % "hadoop-aws" % "3.3.5"  % Provided,
-        "software.amazon.awssdk" % "auth"       % "2.20.7" % Provided,
+        "software.amazon.awssdk" % "auth"       % "2.20.15" % Provided,
         // For Apple Silicon (M1)
         "org.xerial.snappy"  % "snappy-java"  % "1.1.9.1",
         "org.slf4j"          % "slf4j-jdk14"  % SLF4J_VERSION   % Optional,