[GH Actions] Fix base64 command options for macOS 13

Summary:
Change in `base64` command is causing iOS workflow to fail.

Luckily I've run into this before (atulsmadhugiri/Blob@abca30d) and fix is straightforward.

Test Plan: Land and see what happens.

Reviewers: ashoat, tomek, bartek, varun

Reviewed By: varun

Subscribers: wyilio

Differential Revision: https://phab.comm.dev/D9540

.github/workflows/ios_ci.yml

@@ -33,7 +33,7 @@ jobs:
           KEYCHAIN_PATH=$RUNNER_TEMP/app-signing.keychain-db
 
           # import certificate from secrets
-          echo -n "$BUILD_CERTIFICATE_BASE64" | base64 --decode --output $CERTIFICATE_PATH
+          echo -n "$BUILD_CERTIFICATE_BASE64" | base64 --decode -o $CERTIFICATE_PATH
 
           # create temporary keychain
           security create-keychain -p "$KEYCHAIN_PASSWORD" $KEYCHAIN_PATH

.github/workflows/ios_release.yml

@@ -28,7 +28,7 @@ jobs:
           KEYCHAIN_PATH=$RUNNER_TEMP/app-signing.keychain-db
 
           # import certificate from secrets
-          echo -n "$BUILD_CERTIFICATE_BASE64" | base64 --decode --output $CERTIFICATE_PATH
+          echo -n "$BUILD_CERTIFICATE_BASE64" | base64 --decode -o $CERTIFICATE_PATH
 
           # create temporary keychain
           security create-keychain -p "$KEYCHAIN_PASSWORD" $KEYCHAIN_PATH