fix: Trim DSN string before URI parsing

Trailing or leading whitespace in the DSN string (commonly introduced
by copy-paste) causes a URISyntaxException that crashes the application
on startup. Trim the DSN before passing it to the URI constructor.

Fixes GH-5087
Co-Authored-By: Claude <noreply@anthropic.com>

Author: adinauer

sentry/src/main/java/io/sentry/Dsn.java

@@ -50,8 +50,8 @@ URI getSentryUri() {
 
   Dsn(@Nullable String dsn) throws IllegalArgumentException {
     try {
-      Objects.requireNonNull(dsn, "The DSN is required.");
-      final URI uri = new URI(dsn).normalize();
+      final String dsnString = Objects.requireNonNull(dsn, "The DSN is required.").trim();
+      final URI uri = new URI(dsnString).normalize();
       final String scheme = uri.getScheme();
       if (!("http".equalsIgnoreCase(scheme) || "https".equalsIgnoreCase(scheme))) {
         throw new IllegalArgumentException("Invalid DSN scheme: " + scheme);

sentry/src/test/java/io/sentry/DsnTest.kt

@@ -89,6 +89,12 @@ class DsnTest {
     assertEquals("http://host/api/id", dsn.sentryUri.toURL().toString())
   }
 
+  @Test
+  fun `dsn parsed with leading and trailing whitespace`() {
+    val dsn = Dsn("  https://key@host/id  ")
+    assertEquals("https://host/api/id", dsn.sentryUri.toURL().toString())
+  }
+
   @Test
   fun `non http protocols are not accepted`() {
     assertFailsWith<IllegalArgumentException> { Dsn("ftp://publicKey:secretKey@host/path/id") }