Bump pins in README (#57)

Signed-off-by: William Woodruff <william@astral.sh>

Author: woodruffw

README.md

@@ -94,11 +94,11 @@ jobs:
     steps:
       - uses: actions/checkout@de0fac2e4500dabe0009e67214ff5f5447ce83dd # v6.0.2
 
-      - uses: actions/download-artifact@37930b1c2abaa49bbe596cd826c3c89aef350131 # v7.0.0
+      - uses: actions/download-artifact@3e5f45b2cfb9172054b4087a40e8e0b5a5461e7c # v8.0.1
         with:
           name: dist
 
-      - uses: astral-sh/attest-action@f35111fb79f1e4f0150a1ee16cfd4399e3151bdb # v0.0.5
+      - uses: astral-sh/attest-action@f589a42a7efb6fe400b4f400de60b4bc90390027 # v0.0.6
 
       - run: uv publish
 ```
@@ -111,7 +111,7 @@ If you have a custom path (or paths) to your distributions, you can specify them
 via the `paths` input as whitespace-separated values.
 
 ```yaml
-- uses: astral-sh/attest-action@f35111fb79f1e4f0150a1ee16cfd4399e3151bdb # v0.0.5
+- uses: astral-sh/attest-action@f589a42a7efb6fe400b4f400de60b4bc90390027 # v0.0.6
   with:
   paths: |
     custom-dist-dir/*