Kotlin: Update integration tests from -language-version 1.9 to 2.0

Kotlin 2.4.0 no longer supports -language-version 1.9. Update all
integration tests that explicitly pass this flag to use 2.0 instead.
Also update the extractor_information_kotlin1 expected output since
-language-version 2.0 causes the extractor to report 'Uses Kotlin 2: true'.

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: andersfugmann

java/ql/integration-tests/kotlin/all-platforms/enhanced-nullability/test.py

@@ -6,6 +6,6 @@ def test(codeql, java_full):
     codeql.database.create(
         command=[
             f"javac {java_srcs} -d build",
-            "kotlinc -language-version 1.9 user.kt -cp build",
+            "kotlinc -language-version 2.0 user.kt -cp build",
         ]
     )

java/ql/integration-tests/kotlin/all-platforms/external-property-overloads/test.py

@@ -2,5 +2,5 @@
 
 
 def test(codeql, java_full):
-    commands.run("kotlinc -language-version 1.9 test.kt -d lib")
-    codeql.database.create(command="kotlinc -language-version 1.9 user.kt -cp lib")
+    commands.run("kotlinc -language-version 2.0 test.kt -d lib")
+    codeql.database.create(command="kotlinc -language-version 2.0 user.kt -cp lib")

java/ql/integration-tests/kotlin/all-platforms/extractor_information_kotlin1/ExtractorInformation.expected

@@ -9,4 +9,4 @@
 | Percentage of calls with call target | 100 |
 | Total number of lines | 3 |
 | Total number of lines with extension kt | 3 |
-| Uses Kotlin 2: false | 1 |
+| Uses Kotlin 2: true | 1 |

java/ql/integration-tests/kotlin/all-platforms/extractor_information_kotlin1/test.py

@@ -1,2 +1,2 @@
 def test(codeql, java_full):
-    codeql.database.create(command="kotlinc -J-Xmx2G -language-version 1.9 SomeClass.kt")
+    codeql.database.create(command="kotlinc -J-Xmx2G -language-version 2.0 SomeClass.kt")

java/ql/integration-tests/kotlin/all-platforms/file_classes/test.py

@@ -2,5 +2,5 @@
 
 
 def test(codeql, java_full):
-    commands.run("kotlinc -language-version 1.9 A.kt")
-    codeql.database.create(command="kotlinc -cp . -language-version 1.9 B.kt C.kt")
+    commands.run("kotlinc -language-version 2.0 A.kt")
+    codeql.database.create(command="kotlinc -cp . -language-version 2.0 B.kt C.kt")

java/ql/integration-tests/kotlin/all-platforms/java-interface-redeclares-tostring/test.py

@@ -3,4 +3,4 @@
 
 def test(codeql, java_full):
     commands.run(["javac", "Test.java", "-d", "bin"])
-    codeql.database.create(command="kotlinc -language-version 1.9 user.kt -cp bin")
+    codeql.database.create(command="kotlinc -language-version 2.0 user.kt -cp bin")

java/ql/integration-tests/kotlin/all-platforms/kotlin_java_lowering_wildcards/test.py

@@ -8,6 +8,6 @@ def test(codeql, java_full):
         command=[
             "kotlinc kotlindefns.kt",
             "javac JavaUser.java JavaDefns.java -cp .",
-            "kotlinc -language-version 1.9 -cp . kotlinuser.kt",
+            "kotlinc -language-version 2.0 -cp . kotlinuser.kt",
         ]
     )