deps: update dependency protobuf to v3.20.3 (#2169)

.kokoro/requirements.txt

@@ -315,32 +315,29 @@ packaging==21.3 \
     --hash=sha256:dd47c42927d89ab911e606518907cc2d3a1f38bbd026385970643f9c5b8ecfeb \
     --hash=sha256:ef103e05f519cdc783ae24ea4e2e0f508a9c99b2d4969652eed6a2e1ea5bd522
     # via gcp-releasetool
-protobuf==3.19.5 \
-    --hash=sha256:1867f93b06a183f87696871bb8d1e99ee71dbb69d468ce1f0cc8bf3d30f982f3 \
-    --hash=sha256:3c4160b601220627f7e91154e572baf5e161a9c3f445a8242d536ee3d0b7b17c \
-    --hash=sha256:4ee2af7051d3b10c8a4fe6fd1a2c69f201fea36aeee7086cf202a692e1b99ee1 \
-    --hash=sha256:5266c36cc0af3bb3dbf44f199d225b33da66a9a5c3bdc2b14865ad10eddf0e37 \
-    --hash=sha256:5470f892961af464ae6eaf0f3099e2c1190ae8c7f36f174b89491281341f79ca \
-    --hash=sha256:66d14b5b90090353efe75c9fb1bf65ef7267383034688d255b500822e37d5c2f \
-    --hash=sha256:67efb5d20618020aa9596e17bfc37ca068c28ec0c1507d9507f73c93d46c9855 \
-    --hash=sha256:696e6cfab94cc15a14946f2bf72719dced087d437adbd994fff34f38986628bc \
-    --hash=sha256:6a02172b9650f819d01fb8e224fc69b0706458fc1ab4f1c669281243c71c1a5e \
-    --hash=sha256:950abd6c00e7b51f87ae8b18a0ce4d69fea217f62f171426e77de5061f6d9850 \
-    --hash=sha256:9e1d74032f56ff25f417cfe84c8147047732e5059137ca42efad20cbbd25f5e0 \
-    --hash=sha256:9e42b1cf2ecd8a1bd161239e693f22035ba99905ae6d7efeac8a0546c7ec1a27 \
-    --hash=sha256:9f957ef53e872d58a0afd3bf6d80d48535d28c99b40e75e6634cbc33ea42fd54 \
-    --hash=sha256:a89aa0c042e61e11ade320b802d6db4ee5391d8d973e46d3a48172c1597789f8 \
-    --hash=sha256:c0f80876a8ff0ae7064084ed094eb86497bd5a3812e6fc96a05318b92301674e \
-    --hash=sha256:c44e3282cff74ad18c7e8a0375f407f69ee50c2116364b44492a196293e08b21 \
-    --hash=sha256:d249519ba5ecf5dd6b18150c9b6bcde510b273714b696f3923ff8308fc11ae49 \
-    --hash=sha256:d3973a2d58aefc7d1230725c2447ce7f86a71cbc094b86a77c6ee1505ac7cdb1 \
-    --hash=sha256:dca2284378a5f2a86ffed35c6ac147d14c48b525eefcd1083e5a9ce28dfa8657 \
-    --hash=sha256:e63b0b3c42e51c94add62b010366cd4979cb6d5f06158bcae8faac4c294f91e1 \
-    --hash=sha256:f2b599a21c9a32e171ec29a2ac54e03297736c578698e11b099d031f79da114b \
-    --hash=sha256:f2bde37667b18c2b5280df83bc799204394a5d2d774e4deaf9de0eb741df6833 \
-    --hash=sha256:f4f909f4dde413dec435a44b0894956d55bb928ded7d6e3c726556ca4c796e84 \
-    --hash=sha256:f976234e20ab2785f54224bcdafa027674e23663b132fa3ca0caa291a6cfbde7 \
-    --hash=sha256:f9cebda093c2f6bfed88f1c17cdade09d4d96096421b344026feee236532d4de
+protobuf==3.20.3 \
+    --hash=sha256:03038ac1cfbc41aa21f6afcbcd357281d7521b4157926f30ebecc8d4ea59dcb7 \
+    --hash=sha256:28545383d61f55b57cf4df63eebd9827754fd2dc25f80c5253f9184235db242c \
+    --hash=sha256:2e3427429c9cffebf259491be0af70189607f365c2f41c7c3764af6f337105f2 \
+    --hash=sha256:398a9e0c3eaceb34ec1aee71894ca3299605fa8e761544934378bbc6c97de23b \
+    --hash=sha256:44246bab5dd4b7fbd3c0c80b6f16686808fab0e4aca819ade6e8d294a29c7050 \
+    --hash=sha256:447d43819997825d4e71bf5769d869b968ce96848b6479397e29fc24c4a5dfe9 \
+    --hash=sha256:67a3598f0a2dcbc58d02dd1928544e7d88f764b47d4a286202913f0b2801c2e7 \
+    --hash=sha256:74480f79a023f90dc6e18febbf7b8bac7508420f2006fabd512013c0c238f454 \
+    --hash=sha256:819559cafa1a373b7096a482b504ae8a857c89593cf3a25af743ac9ecbd23480 \
+    --hash=sha256:899dc660cd599d7352d6f10d83c95df430a38b410c1b66b407a6b29265d66469 \
+    --hash=sha256:8c0c984a1b8fef4086329ff8dd19ac77576b384079247c770f29cc8ce3afa06c \
+    --hash=sha256:9aae4406ea63d825636cc11ffb34ad3379335803216ee3a856787bcf5ccc751e \
+    --hash=sha256:a7ca6d488aa8ff7f329d4c545b2dbad8ac31464f1d8b1c87ad1346717731e4db \
+    --hash=sha256:b6cc7ba72a8850621bfec987cb72623e703b7fe2b9127a161ce61e61558ad905 \
+    --hash=sha256:bf01b5720be110540be4286e791db73f84a2b721072a3711efff6c324cdf074b \
+    --hash=sha256:c02ce36ec760252242a33967d51c289fd0e1c0e6e5cc9397e2279177716add86 \
+    --hash=sha256:d9e4432ff660d67d775c66ac42a67cf2453c27cb4d738fc22cb53b5d84c135d4 \
+    --hash=sha256:daa564862dd0d39c00f8086f88700fdbe8bc717e993a21e90711acfed02f2402 \
+    --hash=sha256:de78575669dddf6099a8a0f46a27e82a1783c557ccc38ee620ed8cc96d3be7d7 \
+    --hash=sha256:e64857f395505ebf3d2569935506ae0dfc4a15cb80dc25261176c784662cdcc4 \
+    --hash=sha256:f4bd856d702e5b0d96a00ec6b307b0f51c1982c2bf9c0052cf9019e9a544ba99 \
+    --hash=sha256:f4c42102bc82a51108e449cbb32b19b180022941c727bac0cfd50170341f16ee
     # via
     #   gcp-docuploader
     #   gcp-releasetool