fix: remove from workflow

Author: lemire

.github/workflows/tools.yml

@@ -16,7 +16,6 @@ on:
           - acorn
           - acorn-walk
           - ada
-          - base64
           - brotli
           - c-ares
           - cjs-module-lexer
@@ -81,14 +80,6 @@ jobs:
               cat temp-output
               tail -n1 temp-output | grep "NEW_VERSION=" >> "$GITHUB_ENV" || true
               rm temp-output
-          - id: base64
-            subsystem: deps
-            label: dependencies
-            run: |
-              ./tools/dep_updaters/update-base64.sh > temp-output
-              cat temp-output
-              tail -n1 temp-output | grep "NEW_VERSION=" >> "$GITHUB_ENV" || true
-              rm temp-output
           - id: brotli
             subsystem: deps
             label: dependencies

doc/contributing/maintaining/maintaining-dependencies.md

@@ -156,13 +156,6 @@ an abstract syntax tree walker for the ESTree format.
 The [ada](https://github.com/ada-url/ada) dependency is a
 fast and spec-compliant URL parser written in C++.
 
-### base64
-
-The [base64](https://github.com/aklomp/base64) dependency is a base64
-stream encoding/decoding library in C99 with SIMD and OpenMP acceleration.
-It also contains wrapper functions to encode/decode simple
-length-delimited strings.
-
 ### brotli
 
 The [brotli](https://github.com/google/brotli) dependency is