Update core_2.13 to 3.7.6 (#1299)

Author: scala-steward

project/deps.sc

@@ -134,7 +134,7 @@ object Deps {
   def snailgun(force213: Boolean = false) =
     if (force213) ivy"io.github.alexarchambault.scala-cli.snailgun:snailgun-core_2.13:0.4.1-sc2"
     else ivy"io.github.alexarchambault.scala-cli.snailgun::snailgun-core:0.4.1-sc2"
-  def sttp            = ivy"com.softwaremill.sttp.client3:core_2.13:3.7.4"
+  def sttp            = ivy"com.softwaremill.sttp.client3:core_2.13:3.7.6"
   def svm             = ivy"org.graalvm.nativeimage:svm:$graalVmVersion"
   def swoval          = ivy"com.swoval:file-tree-views:2.1.9"
   def testInterface   = ivy"org.scala-sbt:test-interface:1.0"