build: upgrade Kotlin 2.1.21, KSP 2.1.21-2.0.2, Room 2.7.2

Coordinated lockstep upgrade (deferred from the build-stack PR, where these
could not move because Room 2.6.1's generated DAO is incompatible with KSP2):

- Kotlin 2.0.21 -> 2.1.21
- KSP 2.0.21-1.0.27 -> 2.1.21-2.0.2 (KSP2; matched to Kotlin)
- Room 2.6.1 -> 2.7.2 (fixes the KSP2 suspend-DAO Continuation codegen)

Roomigrant 0.3.4 remains compatible; generated migrations still build.
Room exports identical schema JSON (app/schemas unchanged), so there is no
database version change or migration impact (DB stays at version 8).

Author: hawkff

app/build.gradle.kts

@@ -78,9 +78,9 @@ dependencies {
         exclude(group = "androidx.appcompat")
     }
 
-    implementation("androidx.room:room-runtime:2.6.1")
-    ksp("androidx.room:room-compiler:2.6.1")
-    implementation("androidx.room:room-ktx:2.6.1")
+    implementation("androidx.room:room-runtime:2.7.2")
+    ksp("androidx.room:room-compiler:2.7.2")
+    implementation("androidx.room:room-ktx:2.7.2")
     implementation("com.github.MatrixDev.Roomigrant:RoomigrantLib:0.3.4")
     ksp("com.github.MatrixDev.Roomigrant:RoomigrantCompiler:0.3.4")
 

build.gradle.kts

@@ -8,5 +8,5 @@ tasks.register<Delete>("clean") {
 }
 
 plugins {
-    id("com.google.devtools.ksp") version "2.0.21-1.0.27" apply false
+    id("com.google.devtools.ksp") version "2.1.21-2.0.2" apply false
 }

buildSrc/build.gradle.kts

@@ -8,5 +8,5 @@ apply(from = "../repositories.gradle.kts")
 dependencies {
     // Gradle Plugins
     implementation("com.android.tools.build:gradle:8.13.2")
-    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21")
+    implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.21")
 }