Update linphone and mediastreamer2 for real time text fix.

mentioned in merge request mediastreamer2!94 (merged)

mentioned in merge request linphone!380

added 2 commits

• 2798f74a - 1 commit from branch master
• cffd3d06 - Update linphone and mediastreamer2 for real time text fix.

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added 1 commit

• f230c5e7 - Update linphone and mediastreamer2 for real time text fix.

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enabled an automatic merge when the pipeline for f230c5e7 succeeds

merged