[chore] tweak NoLLaMas proof-of-work algorithm (#4090)

# Description

- tweaks the NoLLaMas proof-of-work algorithm to further granularity on time spent computing solutions
- standardizes GoToSocial cookie security directive setting in a CookiePolicy{} type

## Checklist

- [x] I/we have read the [GoToSocial contribution guidelines](https://codeberg.org/superseriousbusiness/gotosocial/src/branch/main/CONTRIBUTING.md).
- [x] I/we have discussed the proposed changes already, either in an issue on the repository, or in the Matrix chat.
- [x] I/we have not leveraged AI to create the proposed changes.
- [x] I/we have performed a self-review of added code.
- [x] I/we have written code that is legible and maintainable by others.
- [x] I/we have commented the added code, particularly in hard-to-understand areas.
- [ ] I/we have made any necessary changes to documentation.
- [ ] I/we have added tests that cover new code.
- [ ] I/we have run tests and they pass locally with the changes.
- [x] I/we have run `go fmt ./...` and `golangci-lint run`.

Co-authored-by: tobi <tobi.smethurst@protonmail.com>
Reviewed-on: https://codeberg.org/superseriousbusiness/gotosocial/pulls/4090
Co-authored-by: kim <grufwub@gmail.com>
Co-committed-by: kim <grufwub@gmail.com>

internal/api/auth/auth_test.go

@@ -24,6 +24,7 @@ import (
 
 	"code.superseriousbusiness.org/gotosocial/internal/admin"
 	"code.superseriousbusiness.org/gotosocial/internal/api/auth"
+	apiutil "code.superseriousbusiness.org/gotosocial/internal/api/util"
 	"code.superseriousbusiness.org/gotosocial/internal/config"
 	"code.superseriousbusiness.org/gotosocial/internal/db"
 	"code.superseriousbusiness.org/gotosocial/internal/email"
@@ -142,7 +143,7 @@ func (suite *AuthStandardTestSuite) newContext(
 
 	// Trigger the session middleware on the context.
 	store := memstore.NewStore(make([]byte, 32), make([]byte, 32))
-	store.Options(middleware.SessionOptions())
+	store.Options(middleware.SessionOptions(apiutil.NewCookiePolicy()))
 	sessionMiddleware := sessions.Sessions("gotosocial-localhost", store)
 	sessionMiddleware(ctx)