fix(auth): close BufferedReader when reading subject token from TEXT file #3725

Job	Run time
filter	1m 9s
dependencies	3m 32s
sdk-platform-java units (8)	4m 38s
sdk-platform-java integration (JDK 24+) (26)	9m 33s
sdk-platform-java integration (11)	10m 43s
java8-compatibility	5m 49s
sdk-platform-java units (17)	4m 2s
unmanaged_dependency_check	10m 35s
sdk-platform-java integration (17)	9m 57s
sdk-platform-java integration (JDK 24+) (25)	10m 7s
sdk-platform-java self-service clients (11)	8m 57s
clirr	3m 11s
sdk-platform-java units (11)	3m 45s
dependency_analyzer_unit_test	1m 37s
sdk-platform-java units (21)	4m 17s
sdk-platform-java units (25)	4m 39s
sdk-platform-java self-service clients (17)	9m 31s
sdk-platform-java units (26)	4m 5s
sdk-platform-java integration (21)	10m 19s
gapic-generator-java-bom	3m 5s
gapic-generator-java (8)	11m 44s
	2h 15m 15s

Provide feedback