Update dependency com.vonage:client to v6.4.2

[mend-for-github-com]

This PR contains the following updates:

Package	Type	Update	Change
com.vonage:client	dependencies	patch	6.4.0 -> 6.4.2

By merging this PR, the issue #1 will be automatically resolved and closed:

Severity	CVSS Score	CVE
High	9.8	CVE-2019-14379
High	9.8	CVE-2019-14540
High	9.8	CVE-2019-14892
High	9.8	CVE-2019-14893
High	9.8	CVE-2019-16335
High	9.8	CVE-2019-16942
High	9.8	CVE-2019-16943
High	9.8	CVE-2019-17267
High	9.8	CVE-2019-17531
High	9.8	CVE-2019-20330
High	9.8	CVE-2020-8840
High	9.8	CVE-2020-9546
High	9.8	CVE-2020-9547
High	9.8	CVE-2020-9548
High	8.8	CVE-2020-10672
High	8.8	CVE-2020-10673
High	8.8	CVE-2020-10968
High	8.8	CVE-2020-10969
High	8.8	CVE-2020-11111
High	8.8	CVE-2020-11112
High	8.8	CVE-2020-11113
High	8.1	CVE-2020-10650
High	8.1	CVE-2020-11619
High	8.1	CVE-2020-11620
High	8.1	CVE-2020-14060
High	8.1	CVE-2020-14061
High	8.1	CVE-2020-14062
High	8.1	CVE-2020-14195
High	8.1	CVE-2020-24616
High	8.1	CVE-2020-24750
High	8.1	CVE-2020-35490
High	8.1	CVE-2020-35491
High	8.1	CVE-2020-35728
High	8.1	CVE-2020-36179
High	8.1	CVE-2020-36180
High	8.1	CVE-2020-36181
High	8.1	CVE-2020-36182
High	8.1	CVE-2020-36183
High	8.1	CVE-2020-36184
High	8.1	CVE-2020-36185
High	8.1	CVE-2020-36186
High	8.1	CVE-2020-36187
High	8.1	CVE-2020-36188
High	8.1	CVE-2020-36189
High	8.1	CVE-2021-20190
High	7.5	CVE-2019-14439
High	7.5	CVE-2020-25649
High	7.5	CVE-2020-36518
High	7.5	CVE-2022-42003
High	7.5	CVE-2022-42004
Medium	6.5	WS-2019-0379
Medium	5.9	CVE-2019-12384
Medium	5.9	CVE-2019-12814
Medium	5.3	CVE-2020-13956
Medium	5.3	CVE-2022-24329
Medium	4.8	CVE-2021-29425

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