package/docker-credential-gcr: bump to version 2.1.30

For release notes since version 2.1.26, see:
https://github.com/GoogleCloudPlatform/docker-credential-gcr/releases

Signed-off-by: Yann E. MORIN <yann.morin.1998@free.fr>
Cc: Yann E. MORIN <yann.morin@orange.com>
[Julien: add link to release notes]
Signed-off-by: Julien Olivain <ju.o@free.fr>

package/docker-credential-gcr/docker-credential-gcr.hash

@@ -1,3 +1,3 @@
 # Locally computed
-sha256  126fdbf7351d2c7aaee6c525d9660738519eae53eeef77920b105fd4d1bc5dbd  docker-credential-gcr-v2.1.26-git4-go2.tar.gz
+sha256  a327753270232cb7f112b98328d5b56ae2da095ad74399b769aa5dad4393c8ae  docker-credential-gcr-v2.1.30-git4-go2.tar.gz
 sha256  c71d239df91726fc519c6eb72d318ec65820627232b2f796219e87dcf35d0ab4  LICENSE

package/docker-credential-gcr/docker-credential-gcr.mk

@@ -4,7 +4,7 @@
 #
 ################################################################################
 
-DOCKER_CREDENTIAL_GCR_VERSION = v2.1.26
+DOCKER_CREDENTIAL_GCR_VERSION = v2.1.30
 DOCKER_CREDENTIAL_GCR_SITE = https://github.com/GoogleCloudPlatform/docker-credential-gcr
 DOCKER_CREDENTIAL_GCR_SITE_METHOD = git