Fix a lot of Scala compilation warnings

[tymcauley]

This resolves a lot of compilation warnings, and also fixes compilation for Chisel 7.5.0 (due to the import conflict introduced by chipsalliance/chisel#5099).

Related issue: N/A

Type of change: other enhancement

Impact: no functional change

Development Phase: implementation

Release Notes
Resolve Scala compilation warnings

[tymcauley]

Removed this change since it's not available on the version of Scala that runs in CI (2.13.12)

diff --git a/src/main/scala/util/SimpleProduct.scala b/src/main/scala/util/SimpleProduct.scala
index 50e99307c..b3cbbeb00 100644
--- a/src/main/scala/util/SimpleProduct.scala
+++ b/src/main/scala/util/SimpleProduct.scala
@@ -20,7 +20,7 @@ trait SimpleProduct extends Product with Equals {
     case _ => false
   }

-  override def hashCode: Int = scala.util.hashing.MurmurHash3.productHash(this)
+  override def hashCode: Int = scala.util.hashing.MurmurHash3.caseClassHash(this)

This deprecation happened in Scala 2.13.17.

[tymcauley]

@sequencer in case you have time to review this PR.

[tymcauley]

Thanks for reviewing this @jerryz123! I now notice that the master branch is ahead of the dev branch. Should I re-target this to be on the master branch instead?

[tymcauley]

@jerryz123 Okay rebased on master, and targeted to merge there now.