fix: Allow SAM-T version update GHA to get latest tag (aws#5154)

There are two issues this patch fixes:
1) the sed for updating the SAM-T version was flipped causing an invalid
base.txt
2) The default fetch depth is 1 causing only the latest commit to be pulled.
For some reason, this causes the tag "git describe" returns nothing. With a
fetch depth of 0, we get the right value.

Co-authored-by: Jacob Fuss <jfuss@users.noreply.github.com>

.github/workflows/automated-updates-to-sam-cli.yml

@@ -64,6 +64,7 @@ jobs:
           repository: aws/serverless-application-model
           path: serverless-application-model
           ref: main
+          fetch-depth: 0
 
       - name: Checkout SAM CLI
         uses: actions/checkout@v3
@@ -81,11 +82,13 @@ jobs:
           git config --global user.name "GitHub Action"
           cd serverless-application-model
           SAM_T_CUR_VERSION=$(git describe --tags --abbrev=0 | sed 's/v//')
+          echo "SAM-T cur version is $SAM_T_CUR_VERSION"
           cd ../aws-sam-cli
           git checkout -b update_sam_transform_version
           SAM_T_PRE_VERSION=$(grep "aws-sam-translator=" requirements/base.txt)
+          echo "SAM-T pre version is $SAM_T_PRE_VERSION"
           git reset --hard develop
-          sed -i "s/aws-sam-translator=$SAM_T_CUR_VERSION/$SAM_T_PRE_VERSION/g" requirements/base.txt; make update-reproducible-reqs
+          sed -i "s/$SAM_T_PRE_VERSION/aws-sam-translator==$SAM_T_CUR_VERSION/g" requirements/base.txt; make update-reproducible-reqs
           cp -r ../serverless-application-model/tests/translator/input ./tests/functional/commands/validate/lib/models
           git status
           git diff --quiet && exit 0 # exit if there is no change