Fix regression in @PropertySource placeholder resolution

Changes in commit 41ade68b50 introduced
a regression causing all but the first location in the
@PropertySource#value array to be ignored during ${...} placeholder
resolution. This change ensures that all locations are processed and
replaced as expected.

Issue: SPR-9133, SPR-9127

spring-context/src/main/java/org/springframework/context/annotation/ConfigurationClassParser.java

@@ -185,7 +185,7 @@ class ConfigurationClassParser {
 				throw new IllegalArgumentException("At least one @PropertySource(value) location is required");
 			}
 			for (int i = 0; i < nLocations; i++) {
-				locations[0] = this.environment.resolveRequiredPlaceholders(locations[0]);
+				locations[i] = this.environment.resolveRequiredPlaceholders(locations[i]);
 			}
 			ClassLoader classLoader = this.resourceLoader.getClassLoader();
 			if (!StringUtils.hasText(name)) {