Bump mysql-connector-java from 6.0.6 to 8.0.13 in /modules/spock (#1056)
Bump mysql-connector-java from 6.0.6 to 8.0.13 in /modules/spock (#1056)

Bumps [mysql-connector-java](https://github.com/mysql/mysql-connector-j) from 6.0.6 to 8.0.13.
<details>
<summary>Changelog</summary>

*Sourced from [mysql-connector-java's changelog](https://github.com/mysql/mysql-connector-j/blob/release/8.0/CHANGES).*

> # Changelog
> # https://dev.mysql.com/doc/relnotes/connector-j/8.0/en/
> 
> Version 8.0.13
> 
>   - Fix for Bug#91317 (28207422), Wrong defaults on collation mappings.
> 
>   - WL#12245, DevAPI: Implement connect timeout.
> 
>   - Fix for Bug#21774249, UNIT TEST FAILS WITH ERROR " 'CEST' IS UNRECOGNIZED TIME ZONE".
> 
>   - WL#11857, DevAPI: Implement connection pooling for xprotocol.
> 
>   - Fix for Bug#91873 (28444461), REMOVE USEOLDUTF8BEHAVIOR CONNECTION PROPERTY.
> 
>   - Fix for Bug#92264 (28594434), JSONPARSER PUTS UNNECESSARY MAXIMUM LIMIT ON JSONNUMBER TO 10 DIGITS.
> 
>   - WL#12110, Extend PropertyDefinitions.PropertyKey usage.
> 
>   - Fix for Bug#81063 (23098159), w/ rewriteBatchedStatements, when 2 tables involved, the rewriting not correct.
> 
>   - Fix for Bug#84813 (25501750), rewriteBatchedStatements fails in INSERT.
> 
>   - Fix for Bug#81196 (23227334), CONNECTOR/J NOT FOLLOWING DATABASE CHARACTER SET.
> 
>   - Fix for Bug#72609 (18749544), SETDATE() NOT USING A PROLEPTIC GREGORIAN CALENDAR.
> 
>   - Fix for Bug#87534 (26730196), UNION ALL query fails when useServerPrepStmts=true on database connection.
>     Test case only. Base bug fixed in MySQL 5.7.22.
> 
>   - Fix for Bug#89948 (27658489), Batched statements are not committed for useLocalTransactionState=true.
> 
>   - Fix for BUG#22305979, WRONG RECORD UPDATED IF SENDFRACTIONALSECONDS=FALSE AND SMT IS SCROLLABLE.
> 
>   - Fix for Bug#27102307, CHANGE USESSL AND VERIFYSERVERCERTIFICATE TO SSLMODE OPTION.
> 
>   - Fix for Bug#28150662, CONNECTOR/J 8 MALFORMED DATABASE URL EXCEPTION WHIT CORRECT URL STRING.
> 
>   - Fix for Bug#91421 (28246270), ALLOWED VALUES FOR ZERODATETIMEBEHAVIOR ARE INCOMPATIBLE WITH NETBEANS.
> 
>   - Fix for Bug#23045604, XSESSION.GETURI() RETURNS NPE.
> 
>   - Fix for Bug#21914769, NPE WHEN TRY TO EXECUTE INVALID JSON STRING.
> 
>   - Fix for Bug#BUG#90887 (28034570), DATABASEMETADATAUSINGINFOSCHEMA#GETTABLES FAILS IF METHOD ARGUMENTS ARE NULL.
> 
>   - Fix for Bug#28207088, C/JAVA: UPDATECLOB(INT COLUMNLABEL, JAVA.SQL.CLOB CLOB) IS FAILING.
> 
>   - Fix for Bug#27629553, NPE FROM GETSESSION() FOR SSL CONNECTION WHEN NO PASSWORD PASSED.
> 
></table> ... (truncated)
</details>
<details>
<summary>Commits</summary>

- [`66459e9`](https://github.com/mysql/mysql-connector-j/commit/66459e9d39c8fd09767992bc592acd2053279be6) Update for Bug#27102307 fix.
- [`8838bbc`](https://github.com/mysql/mysql-connector-j/commit/8838bbc6413c48de369da90aa222c04ce7ca5a7a) Fix for testPooledSessions.
- [`20e3aaa`](https://github.com/mysql/mysql-connector-j/commit/20e3aaabbb63b49f01039eee7ea7e04dd6850889) GPL license book update.
- [`264f746`](https://github.com/mysql/mysql-connector-j/commit/264f746930fc6bcde0c6af8982544533addb63ee) Fix for testConnectionTimeout.
- [`415c3cb`](https://github.com/mysql/mysql-connector-j/commit/415c3cb88b0b3f43a2508ef79835b90c4902a6cb) Fix for Bug#91317 (28207422), Wrong defaults on collation mappings.
- [`33da3f3`](https://github.com/mysql/mysql-connector-j/commit/33da3f3987029bab0068eac3beb7ea79e8e62162) Protobuf version updated to 3.6.1.
- [`47982f4`](https://github.com/mysql/mysql-connector-j/commit/47982f42ae2bb858c51c9f711133b7592e3a3a85) Fix for Bug#21774249.
- [`8b59b9e`](https://github.com/mysql/mysql-connector-j/commit/8b59b9ebab61cc97bafe77ee05f79829b1376e47) WL#12245, DevAPI: Implement connect timeout.
- [`edc3f92`](https://github.com/mysql/mysql-connector-j/commit/edc3f92195ab7e837e525111996743fea641dd96) Fix for Bug#21774249, UNIT TEST FAILS WITH ERROR " 'CEST' IS UNRECOGNIZED TIM...
- [`94c7244`](https://github.com/mysql/mysql-connector-j/commit/94c7244d0fcac698707f62080e49760c73321899) Fix for property descriptions.
- Additional commits viewable in [compare view](https://github.com/mysql/mysql-connector-j/compare/6.0.6...8.0.13)
</details>
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