Detekt: enable rule exceptions.SwallowedException and fix existing issue.

libraries/core/src/main/kotlin/io/element/android/libraries/core/hash/Hash.kt

@@ -21,7 +21,7 @@ fun String.md5() = try {
     digest.digest()
         .joinToString("") { String.format(locale, "%02X", it) }
         .lowercase(locale)
-} catch (exc: Exception) {
+} catch (_: Exception) {
     // Should not happen, but just in case
     hashCode().toString()
 }

libraries/core/src/main/kotlin/io/element/android/libraries/core/uri/UrlUtils.kt

@@ -14,7 +14,7 @@ fun String.isValidUrl(): Boolean {
     return try {
         URI(this).toURL()
         true
-    } catch (t: Throwable) {
+    } catch (_: Throwable) {
         false
     }
 }