fix(ci): replace fake denoland/setup-deno SHA pin (3 sites) (#61)

The pin `denoland/setup-deno@5fae568d37c3b73e0e4ca63d4e2c4e324a2b3497`
at .github/workflows/e2e.yml:44,67,90 is fabricated (`gh api repos/
denoland/setup-deno/commits/5fae568... -> 422`). All 3 jobs that
attempt to run (e2e, crosscutting, benchmarks) would have failed at
action resolution.

Replaced with verified v2.0.4 pin
`667a34cdef165d8d2b2e98dde39547c9daac7282`.

Provenance: propagated from rsr-template-repo#81 (merged); discovered
while wiring CI for snifs (hyperpolymath/snifs#30). One of the active-
pin fan-out PRs alongside reposystem (incoming) and the throttled
sweep of ~16 commented-stub repos.

Author: hyperpolymath

.github/workflows/e2e.yml

@@ -41,7 +41,7 @@ jobs:
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
 
       - name: Install Deno
-        uses: denoland/setup-deno@5fae568d37c3b73e0e4ca63d4e2c4e324a2b3497  # v2
+        uses: denoland/setup-deno@667a34cdef165d8d2b2e98dde39547c9daac7282  # v2.0.4
         with:
           deno-version: v2.x
 
@@ -64,7 +64,7 @@ jobs:
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
 
       - name: Install Deno
-        uses: denoland/setup-deno@5fae568d37c3b73e0e4ca63d4e2c4e324a2b3497  # v2
+        uses: denoland/setup-deno@667a34cdef165d8d2b2e98dde39547c9daac7282  # v2.0.4
         with:
           deno-version: v2.x
 
@@ -87,7 +87,7 @@ jobs:
         uses: actions/checkout@34e114876b0b11c390a56381ad16ebd13914f8d5  # v4
 
       - name: Install Deno
-        uses: denoland/setup-deno@5fae568d37c3b73e0e4ca63d4e2c4e324a2b3497  # v2
+        uses: denoland/setup-deno@667a34cdef165d8d2b2e98dde39547c9daac7282  # v2.0.4
         with:
           deno-version: v2.x