Update audioTracks/videoTracks/textTracks versions

This change corrects the version data for the audioTracks, videoTracks,
and textTracks members of the SourceBuffer interface to reflect, per
https://chromium.googlesource.com/chromium/src/+/92333c0e5ca6b7768e5bcf6d41ff8fc733ebbfc1
and https://trac.webkit.org/changeset/178172/webkit, the actual versions
of Chrome and Safari which first shipped support for them.

Fixes mdn#6102

api/SourceBuffer.json

@@ -446,10 +446,10 @@
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/SourceBuffer/audioTracks",
           "support": {
             "chrome": {
-              "version_added": "23"
+              "version_added": "49"
             },
             "chrome_android": {
-              "version_added": "33"
+              "version_added": "49"
             },
             "edge": {
               "version_added": "12"
@@ -465,22 +465,22 @@
               "notes": "Only works on Windows 8+."
             },
             "opera": {
-              "version_added": "15"
+              "version_added": "36"
             },
             "opera_android": {
-              "version_added": "14"
+              "version_added": "36"
             },
             "safari": {
-              "version_added": "8"
+              "version_added": "11"
             },
             "safari_ios": {
-              "version_added": false
+              "version_added": "11"
             },
             "samsunginternet_android": {
-              "version_added": "3.0"
+              "version_added": "5.0"
             },
             "webview_android": {
-              "version_added": "4.4.3"
+              "version_added": "49"
             }
           },
           "status": {
@@ -1135,10 +1135,10 @@
               "version_added": false
             },
             "safari": {
-              "version_added": "8"
+              "version_added": "11"
             },
             "safari_ios": {
-              "version_added": false
+              "version_added": "11"
             },
             "samsunginternet_android": {
               "version_added": false
@@ -1321,10 +1321,10 @@
           "mdn_url": "https://developer.mozilla.org/docs/Web/API/SourceBuffer/videoTracks",
           "support": {
             "chrome": {
-              "version_added": "23"
+              "version_added": "49"
             },
             "chrome_android": {
-              "version_added": "33"
+              "version_added": "49"
             },
             "edge": {
               "version_added": "12"
@@ -1340,22 +1340,22 @@
               "notes": "Only works on Windows 8+."
             },
             "opera": {
-              "version_added": "15"
+              "version_added": "36"
             },
             "opera_android": {
-              "version_added": "14"
+              "version_added": "36"
             },
             "safari": {
-              "version_added": "8"
+              "version_added": "11"
             },
             "safari_ios": {
-              "version_added": false
+              "version_added": "11"
             },
             "samsunginternet_android": {
-              "version_added": "3.0"
+              "version_added": "5.0"
             },
             "webview_android": {
-              "version_added": "4.4.3"
+              "version_added": "49"
             }
           },
           "status": {