[release/8.x] Bump AWSSDK.SecurityToken from 4.0.5.17 to 4.0.5.19

---
updated-dependencies:
- dependency-name: AWSSDK.SecurityToken
  dependency-version: 4.0.5.19
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

eng/dependabot/independent/Versions.props

@@ -16,7 +16,7 @@
     <NJsonSchemaVersion>11.5.2</NJsonSchemaVersion>
     <SwashbuckleAspNetCoreVersion>10.1.7</SwashbuckleAspNetCoreVersion>
     <AwsSdkS3Version>4.0.20.4</AwsSdkS3Version>
-    <AwsSdkSecurityTokenVersion>4.0.5.17</AwsSdkSecurityTokenVersion>
+    <AwsSdkSecurityTokenVersion>4.0.5.19</AwsSdkSecurityTokenVersion>
 
     <!--
       Moq version & constants derived from Moq.