PYTHON-3541 Use bash instead of sh in perf testing (#1127)

Author: ShaneHarvey

.evergreen/perf.yml

@@ -105,7 +105,7 @@ functions:
       params:
         script: |
           ${PREPARE_SHELL}
-          MONGODB_VERSION=${VERSION} TOPOLOGY=${TOPOLOGY} AUTH=${AUTH} SSL=${SSL} STORAGE_ENGINE=${STORAGE_ENGINE} sh ${DRIVERS_TOOLS}/.evergreen/run-orchestration.sh
+          MONGODB_VERSION=${VERSION} TOPOLOGY=${TOPOLOGY} AUTH=${AUTH} SSL=${SSL} STORAGE_ENGINE=${STORAGE_ENGINE} bash ${DRIVERS_TOOLS}/.evergreen/run-orchestration.sh
     # run-orchestration generates expansion file with the MONGODB_URI for the cluster
     - command: expansions.update
       params:
@@ -116,7 +116,7 @@ functions:
       params:
         script: |
           ${PREPARE_SHELL}
-          sh ${DRIVERS_TOOLS}/.evergreen/stop-orchestration.sh
+          bash ${DRIVERS_TOOLS}/.evergreen/stop-orchestration.sh
 
   "run perf tests":
     - command: shell.exec
@@ -125,7 +125,7 @@ functions:
         working_dir: "src"
         script: |
           ${PREPARE_SHELL}
-          PROJECT_DIRECTORY=${PROJECT_DIRECTORY} sh ${PROJECT_DIRECTORY}/.evergreen/run-perf-tests.sh
+          PROJECT_DIRECTORY=${PROJECT_DIRECTORY} bash ${PROJECT_DIRECTORY}/.evergreen/run-perf-tests.sh
 
   "attach benchmark test results":
     - command: attach.results
@@ -182,7 +182,7 @@ functions:
           ${PREPARE_SHELL}
           file="${PROJECT_DIRECTORY}/.evergreen/install-dependencies.sh"
           # Don't use ${file} syntax here because evergreen treats it as an empty expansion.
-          [ -f "$file" ] && sh $file || echo "$file not available, skipping"
+          [ -f "$file" ] && bash $file || echo "$file not available, skipping"
 
 pre:
   - func: "fetch source"