chore: update Gleam version to 1.14 and fix deprecation warnings

Update CI workflows to use Gleam 1.14. Replace deprecated result.then
calls with result.try to address deprecation warnings from the stdlib.

Author: tylerbutler

.github/workflows/release.yml

@@ -13,7 +13,7 @@ jobs:
       - uses: erlef/setup-beam@v1
         with:
           otp-version: '26'
-          gleam-version: '1.6'
+          gleam-version: '1.14'
 
       - run: |
           version="v$(cat gleam.toml | grep -m 1 "version" | sed -r "s/version *= *\"([[:digit:].]+)\"/\1/")"

.github/workflows/test.yml

@@ -14,7 +14,7 @@ jobs:
       - uses: erlef/setup-beam@v1
         with:
           otp-version: '26'
-          gleam-version: '1.6'
+          gleam-version: '1.14'
           rebar3-version: '3'
       - run: gleam test
       - run: gleam format --check src test