refactor: remove bolthold and gofakes3 deps (#1336)

1. Replace bolthold with direct bbolt access in the cache server. bolthold has not changed since March 2024 and kept `encoding/gob` in the binary although the store was already JSON. The on-disk layout stays the same, so existing caches keep working, and the index buckets bolthold left behind are dropped on the first sweep. Queries now run against an in-memory copy of the entries that is only re-read after another process wrote to the store, so lookups and sweeps no longer decode the whole store.

2. Replace gofakes3 with a small in-memory S3 fake in the one test that used it, which removes aws-sdk-go-v2, afero, mgo and x/tools from the module graph.

Reviewed-on: https://gitea.com/gitea/runner/pulls/1336
Reviewed-by: bircni <bircni@icloud.com>
Co-authored-by: silverwind <me@silverwind.io>

go.sum

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@@ -47,8 +19,6 @@ github.com/containerd/errdefs/pkg v0.3.0/go.mod h1:NJw6s9HwNuRhnjJhM7pylWwMyAkmC
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@@ -70,8 +40,6 @@ github.com/google/uuid v1.6.0 h1:NIvaJDMOsjHA8n1jAhLSgzrAzy1Hgr+hNrb57e+94F0=
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@@ -94,7 +62,6 @@ github.com/opencontainers/go-digest v1.0.0 h1:apOUWs51W5PlhuyGyz9FCeeBIOUDA/6nW8
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@@ -104,31 +71,17 @@ github.com/prometheus/common v0.70.1/go.mod h1:VdFUQDMZK3VLkurFUVhia6uys/0suUp86
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