(cherry picked from commit 6a6abac)

The setProperty() and withProperty() methods in MockEnvironment were
originally introduced with (String, String) signatures; however, they
should have always had (String, Object) signatures in order to comply
with the MockPropertySource and PropertySource APIs.

To address that, this commit changes the signatures of these methods so
that they only accept Object values for properties.

NOTE: this commit only affects the internal MockEnvironment used as a
test fixture. This commit does not affect the official, public
MockEnvironment implementation in spring-test.

See gh-34947
See gh-34948

(cherry picked from commit d782647)

This commit introduces a "regression test" which demonstrates that
PropertySourcesPlaceholderConfigurer uses the ConversionService from
the Environment.

See gh-34936

Closes gh-34950

(cherry picked from commit 15d1455)

(cherry picked from commit 222702f)

(cherry picked from commit 3c265e1)

Previously, when saving a WebSession, the system did not check whether
the session ID already existed. As a result, even if the session being
saved was an update to an existing one, it was incorrectly treated as a
new session, and a "maximum sessions exceeded" error was triggered.

This fix ensures that if a WebSession with the same ID already exists,
it will be updated rather than counted as a new session, thereby
preventing unnecessary session limit violations.

See gh-35013
Closes gh-35018

Signed-off-by: Mohammad Saeed Nouri <[email protected]>
(cherry picked from commit c04902f)

See gh-35013
See gh-35018

(cherry picked from commit 4d2cc4a)

Includes SLF4J 2.0.17, Groovy 4.0.27, FreeMarker 2.3.34

Closes gh-35022

Prior to this commit, the "filename" parameter value for the
"Content-Disposition" header would contain non-printable characters,
causing parsing issues for HTTP clients.
This commit ensures that all non-printable characters are encoded.

Fixes gh-35035