Upgrade golang from 1.15.2 to 1.16.9 (milvus-io#11393)

Signed-off-by: Edward Zeng <[email protected]>

.golangci.yml

@@ -44,6 +44,8 @@ issues:
     - G307
     # Use of weak random number generator math/rand
     - G404
+    # Exclude copylocks
+    - copylocks
   # Maximum issues count per one linter. Set to 0 to disable. Default is 50.
   max-issues-per-linter: 0
   # Maximum count of issues with the same text. Set to 0 to disable. Default is 3.

build/docker/builder/cpu/centos7/Dockerfile

@@ -46,7 +46,7 @@ ENV GOPATH /go
 ENV GOROOT /usr/local/go
 ENV GO111MODULE on
 ENV PATH $GOPATH/bin:$GOROOT/bin:$PATH
-RUN mkdir -p /usr/local/go && wget -qO- "https://golang.org/dl/go1.15.2.linux-amd64.tar.gz" | tar --strip-components=1 -xz -C /usr/local/go && \
+RUN mkdir -p /usr/local/go && wget -qO- "https://golang.org/dl/go1.16.9.linux-amd64.tar.gz" | tar --strip-components=1 -xz -C /usr/local/go && \
     mkdir -p "$GOPATH/src" "$GOPATH/bin" && \
     curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b ${GOPATH}/bin v1.43.0 && \
     export GO111MODULE=on && go get github.com/quasilyte/go-ruleguard/cmd/[email protected] && \

build/docker/builder/cpu/ubuntu18.04/Dockerfile

@@ -23,7 +23,7 @@ ENV GOPATH /go
 ENV GOROOT /usr/local/go
 ENV GO111MODULE on
 ENV PATH $GOPATH/bin:$GOROOT/bin:$PATH
-RUN mkdir -p /usr/local/go && wget -qO- "https://golang.org/dl/go1.15.2.linux-amd64.tar.gz" | tar --strip-components=1 -xz -C /usr/local/go && \
+RUN mkdir -p /usr/local/go && wget -qO- "https://golang.org/dl/go1.16.9.linux-amd64.tar.gz" | tar --strip-components=1 -xz -C /usr/local/go && \
     mkdir -p "$GOPATH/src" "$GOPATH/bin" && \
     curl -sSfL https://raw.githubusercontent.com/golangci/golangci-lint/master/install.sh | sh -s -- -b ${GOPATH}/bin v1.43.0 && \
     export GO111MODULE=on && go get github.com/quasilyte/go-ruleguard/cmd/[email protected] && \