SSLHandshakeException: Received fatal alert: bad_certificate

### Bug Description
Spring Boot application(s) are experiencing an inconsistent issue where your SSL connection between Cloud Run and Cloud SQL works reliably for about a month before consistently failing.

### Stacktrace
`
javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate at sun.security.ssl.Alert.createSSLException at sun.security.ssl.Alert.createSSLException at sun.security.ssl.TransportContext.fatal at sun.security.ssl.Alert$AlertConsumer.consume at sun.security.ssl.TransportContext.dispatch at sun.security.ssl.SSLTransport.decode at sun.security.ssl.SSLSocketImpl.decode at sun.security.ssl.SSLSocketImpl.readApplicationRecord at sun.security.ssl.SSLSocketImpl$AppInputStream.read at org.postgresql.core.VisibleBufferedInputStream.readMore ( org/postgresql.core/VisibleBufferedInputStream.java:192 ) at org.postgresql.core.VisibleBufferedInputStream.ensureBytes ( org/postgresql.core/VisibleBufferedInputStream.java:159 ) at org.postgresql.core.VisibleBufferedInputStream.ensureBytes ( org/postgresql.core/VisibleBufferedInputStream.java:144 ) at org.postgresql.core.VisibleBufferedInputStream.read ( org/postgresql.core/VisibleBufferedInputStream.java:76 ) at org.postgresql.core.PGStream.receiveChar ( org/postgresql.core/PGStream.java:476 ) at org.postgresql.core.v3.ConnectionFactoryImpl.enableSSL ( org/postgresql.core.v3/ConnectionFactoryImpl.java:607 ) at org.postgresql.core.v3.ConnectionFactoryImpl.tryConnect ( org/postgresql.core.v3/ConnectionFactoryImpl.java:201 ) at org.postgresql.core.v3.ConnectionFactoryImpl.openConnectionImpl ( org/postgresql.core.v3/ConnectionFactoryImpl.java:268 ) at org.postgresql.core.ConnectionFactory.openConnection ( org/postgresql.core/ConnectionFactory.java:54 ) at org.postgresql.jdbc.PgConnection. ( org/postgresql.jdbc/PgConnection.java:273 ) at org.postgresql.Driver.makeConnection ( org/postgresql/Driver.java:446 ) at org.postgresql.Driver.connect ( org/postgresql/Driver.java:298 ) at org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver ( org/apache.tomcat.jdbc.pool/PooledConnection.java:346 ) at org.apache.tomcat.jdbc.pool.PooledConnection.connect ( org/apache.tomcat.jdbc.pool/PooledConnection.java:227 ) at org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection ( org/apache.tomcat.jdbc.pool/ConnectionPool.java:779 ) at org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection ( org/apache.tomcat.jdbc.pool/ConnectionPool.java:707 ) at org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection ( org/apache.tomcat.jdbc.pool/ConnectionPool.java:199 ) at org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection ( org/apache.tomcat.jdbc.pool/DataSourceProxy.java:133 ) ....
`

### Environment

1. OS Type and version: Docker, Ubuntu Jammy
2. Java version: Eclipse Temurin 21
3. Google Cloud: Cloud Run, Cloud SQL Postgres
 
### Additional Details

We have initially opened an incident with Google Support for this issue, Case 58576713. Based on initial investigation, no issues were found with Cloud Run or Cloud SQL. Recommendation from Google support team that the most effective next step is to file an issue directly with the spring-cloud-gcp project on GitHub.