chore: update libraries bom, fix unparsable file

Author: diegomarquezp

generation_config.yaml

@@ -1,6 +1,6 @@
 gapic_generator_version: 2.56.2
 googleapis_commitish: 261895f1d8ced9564f4cf872f7f4f9a1f4c615d3
-libraries_bom_version: 
+libraries_bom_version: 26.59.0
 libraries:
   - api_shortname: spanner
     name_pretty: Cloud Spanner

google-cloud-spanner/src/main/java/com/google/cloud/spanner/connection/ClientSideStatementValueConverters.java

@@ -272,9 +272,12 @@ public PgDurationConverter(String allowedValues) {
   /** Converter from string to possible values for read only staleness ({@link TimestampBound}). */
   static class ReadOnlyStalenessConverter
       implements ClientSideStatementValueConverter<TimestampBound> {
+	// Some backslashes need to be specified as hexcode.
+	// See https://github.com/google/google-java-format/issues/1253
     static final ReadOnlyStalenessConverter INSTANCE =
         new ReadOnlyStalenessConverter(
-            "'((STRONG)|(MIN_READ_TIMESTAMP)[\\t ]+((\\d{4})-(\\d{2})-(\\d{2})([Tt](\\d{2}):(\\d{2}):(\\d{2})(\\.\\d{1,9})?)([Zz]|([+-])(\\d{2}):(\\d{2})))|(READ_TIMESTAMP)[\\t ]+((\\d{4})-(\\d{2})-(\\d{2})([Tt](\\d{2}):(\\d{2}):(\\d{2})(\\.\\d{1,9})?)([Zz]|([+-])(\\d{2}):(\\d{2})))|(MAX_STALENESS)[\\t ]+((\\d{1,19})(s|ms|us|ns))|(EXACT_STALENESS)[\\t ]+((\\d{1,19})(s|ms|us|ns)))'");
+            "'((STRONG)|(MIN_READ_TIMESTAMP)[\\t ]+((\\d{4})-(\\d{2})-(\\d{2})([Tt](\\d{2}):(\\d{2}):(\\d{2})(\\.\\d{1,9})?)([Zz]|([+-])(\\d{2}):(\\d{2})))|(READ_TIMESTAMP)[\u005Ct ]+((\\d{4})-(\\d{2})-(\\d{2})([Tt](\\d{2}):(\\d{2}):(    \\d{2})(\\.\\d{1,9})?)([Zz]|([+-])(\\d{2}):(\\d{2})))|(MAX_STALENESS)[\u005Ct ]+((\\d{1,19})(s|ms|us|ns))|(EXACT_STALENESS)[\\t ]+((\\d{1,19})(s|ms|us|ns)))'");
+
 
     private final Pattern allowedValues;
     private final CaseInsensitiveEnumMap<Mode> values = new CaseInsensitiveEnumMap<>(Mode.class);