Bumping gaia.json for 4 gaia revision(s) a=gaia-bump

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https://hg.mozilla.org/integration/gaia-2_1/rev/44bad583615d
Author: albertopq <albert.pastor@gmail.com>
Desc: Merge pull request #25493 from albertopq/1088623-add-lib-lockscreen-2.1

Bug 1088623 - Adding lockscreen libary to 2.1 a=testonly

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https://hg.mozilla.org/integration/gaia-2_1/rev/4107cbb51798
Author: albertopq <apastor@mozilla.com>
Desc: Bug 1088623 - Adding lockscreen libary to 2.1

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https://hg.mozilla.org/integration/gaia-2_1/rev/f29fa1217b5b
Author: tamarahills <thills@mozilla.com>
Desc: Merge pull request #25552 from tamarahills/bugfix/1075699_2_1_uplift

Bug 1075699 - Suppress ModifiedDialError to user for TMobile Voicemail

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https://hg.mozilla.org/integration/gaia-2_1/rev/93a8d3175750
Author: Tamara Hills <thills@mozilla.com>
Desc: Bug 1075699 - Suppress ModifiedDialError to user from gecko for STK voicemail redirect. r=drs
Bumping manifests a=b2g-bump