chore: remove bumping cosign in go.mod when updating bootstrap tools (a…

…nchore#1452)

.github/workflows/update-bootstrap-tools.yml

@@ -39,10 +39,6 @@ jobs:
           sed -r -i -e 's/^(YAJSV_VERSION = ).*/\1'${YAJSV_LATEST_VERSION}'/' Makefile
           sed -r -i -e 's/^(COSIGN_VERSION = ).*/\1'${COSIGN_LATEST_VERSION}'/' Makefile
           
-          # update cosign in go.mod as well
-          go get github.com/sigstore/cosign@$COSIGN_LATEST_VERSION
-          go mod tidy
-          
           # export the versions for use with create-pull-request
           echo "::set-output name=GOLANGCILINT::$GOLANGCILINT_LATEST_VERSION"
           echo "::set-output name=BOUNCER::$BOUNCER_LATEST_VERSION"
@@ -76,4 +72,4 @@ jobs:
             - [yajsv ${{ steps.latest-versions.outputs.YAJSV }}](https://github.com/neilpa/yajsv/releases/tag/${{ steps.latest-versions.outputs.YAJSV }})
             - [cosign ${{ steps.latest-versions.outputs.COSIGN }}](https://github.com/sigstore/cosign/releases/tag/${{ steps.latest-versions.outputs.COSIGN }})  
             This is an auto-generated pull request to update all of the bootstrap tools to the latest versions.
-          token: ${{ steps.generate-token.outputs.token }}
+          token: ${{ steps.generate-token.outputs.token }}