chore: ignore Kotlin 2 .salive files

This appears to be a 'session-is-alive' file

https://github.com/JetBrains/kotlin/blob/ca34e5d2fd255ed0501bae4fae3d3691dc40d375/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/compilerRunner/GradleKotlinCompilerRunner.kt#L458

Example:

.kotlin/sessions/kotlin-compiler-9293527262404664068.salive

Author: david-allison

.gitignore

@@ -63,3 +63,7 @@ AnkiDroid/ACRA-INSTALLATION
 
 #ignore the local insufficient memory for the Java Runtime Environment files
 hs_err_pid*
+
+# Ignore kotlin 2.0 compiler files (.salive: session-is-alive)
+# https://github.com/JetBrains/kotlin/blob/ca34e5d2fd255ed0501bae4fae3d3691dc40d375/libraries/tools/kotlin-gradle-plugin/src/common/kotlin/org/jetbrains/kotlin/compilerRunner/GradleKotlinCompilerRunner.kt#L458
+/.kotlin